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MOOC for Microcontroller Design Course - ECE

1. click here to view your code Your Youtube Page Invalid URL for 123Circuits Link When the submission deadline passed we log in with the TA role and assign the assessment to every student who has submitted their work completely We check the database to see if one student are assigned four different submissions to review if the one who didn t submit his work are assigned and so many corner cases like that We modify our code by checking all these situations and finding errors Then we test the assessment part each student are assigned with four assessment tasks click them we can see the grading form to complete We try to fill the form in different way and see what the database has received when submit different things And also we test if we can suggest a score that is bigger than the max score or if we can fill one form during two different times The assessment page 51 Home Syllabus LabTable Forum Guidance Assessment Page There are four assessments assigned to you Your work will be reviewed by other four peers too Please view the assessment instruction first and complete the four assesments before the assessment deadline Assessment Instruction Assessment1 Assessment2 Assessment3 Assessment4 You have already complete this assessment1 You have already complete this assessment2 You have already complete this assessment3 You have already complete this assessment4 The grading form page for assessment St
2. when you click on the regrade button and you are not qualified to regrade Once your work has been regrade by the TA you can see the regrade your regrade score As for peer review part we decide to let one student assess four other students work for one lab This module is suitable for MOOC because of the large amount of students Contrary to the peer review university often uses we develop more structured forms of assessment grading In our system students not only create and submit their own work They also participate on the assessment of others submission give them feedback and suggest a grade for them A student s final grade is contains two parts one part is how well a student does with their work The other is how well a student assessed his peers This kind of strategy gives the motivation for students to assess others works during which they can have opportunity to see others work and learn from them Also students can see how his peers think about his assignment and learn from these comments As for how to compute the score of one student we decide to use Rubric algorithm We divided each work into several dimension professor will provide criteria for every dimension about how to assess it For all assessment dimensions calculate the arithmetic mean and sample standard deviation Because there are normally four assessments for one assignment we are trying to find the best assessment For our purposes the bes
3. Appendix B PHP codes Please go to the zip file phpcodes zip in the source code package provided with the report Appendix C The SQL we use in the system Please go to the zip file dbSQL zip in the source code package provided with the report 64
4. designed and how functions are implemented based the on the database is illustrated in part two of the report 1 3 The structure of the report In the following sections of the report a large number of details of the design of the MOOC in different categories are being introduced Part two illustrates in great detail how we build the server side system in for the MOOC including how we build the database system in order to store and retrieve user data keep safety and privacy and lay part of the foundation of the grading subsystem in the database design as well as how the data flow and logic is implemented for the whole system This part is also divided into In part three the content of the MOOC is introduced Course policy instructions for labs video lectures are all included Course policy presents the rules of the course as well as the structure and the schedule of it Content of each lab and the considerations on why to put it into the MOOC and how to teach for it are talked about In part four we treat our design of the MOOC from the view of software engineering and introduce how we tested the system and services for safety and availability along with the bugs found on the way of testing A conclusion of the project is included in part 5 and part 6 serves to list reference 2 System Design 2 1 Basic design of using what kind of technology We decide to use PHP MySQL to develop our websites and use wordpress as a basi
5. pushbuttons etc Lab2 is intended for teaching people ADC PWM and how to use relative functions of them on the simulation platform Lab3 are made to give instructions on 7 segments Lab4 introduces how to build a pointer using servo and functions about this topic on 123d circuits io the simulation platform our MOOC relies on There are grading criteria for each lab to measure how well people learn and do their own lab All the labs and grading criteria are introduced with more details in part 3 of the report To host all the material or links to materials needed for the course and to carry out functions of the MOOC like authentication lab assignments and submissions regrade requests a data driven server side system is needed to be established to take up these tasks Now we have already make the server side system for the MOOC based on PHP and WordPress along with Mysql run on the server of School of Electrical and Computer Engineering The database design of the system is now completed for user data storage and retrieval Basic Functions of the MOOC to needed like authentication homework or lab assignment are all ready Web based peer review is an advanced function completed for the project to allow users of the MOOC to grade others works and make comments on them to improve the comprehend of the knowledge of the course for both the graders and the people whose work is graded by others Though all these functions work fine there are some
6. the prerequisites and suggested materials They can also find a course s outline tells what are the specific lab and how the grading system works For the guidance page you will get an understanding of how to use our website and things students need to pay attention to We design this page to make users easier learn the basic functions of our websites It is more like a user manual For the lab table page It display the basic information of all the labs you need to finish this semester and their instruction start time and due time When we click on one of those labs we can get to the assignment page This page contains all the procedures one assignment should include and can be seen only when you are logged in We design to divide one assignment into four phases They are Start phase which you can submit and resubmit your work the assessment phase which student can assess other s work the grades phase which students can see their grades and re grade phase which students can request re grade and if they do so to see their re grade score The first phase is start phase In this phase you can see the instruction of this assignment and submit your work Once submitted you could resubmit your work and download your submission We decided to only save only one copy of students works because we 10 are graded on their final submission by the due time and it also save more space If one student continue to upload their
7. user_pass Text NULL the encryted password of the user user_nicename Text NULL the nice name of the user user_email Text NULL the user s email address user_registered datetime NULL the time when user registered display_name text NULL the display name of the user 17 Table Assignment This table keeps the information about the assignment instances and their settings Field Info assignmentID int 10 auto numbered serial the title of th ject it t th assignmentName char 255 dde REM RTUMDE SU QUE course outline M the path of th ipti fth j descriptionPath text NULL OE DE deari puoi geie pragai stored in server timemodified Avian the timestamp when the module was modified maxSubmitGrade int 5 80 the percentage of grade for submission maxAssessGrade the percentage of grade for assessment 0 students work Factor when evaluating assessment job required level of assessment similarit assessmentFactor float 3 2 5 7 ee E erit very strict 0 will be started manually gt 0 the submissionStart timestamp of the start of the submission phase assignment start time submissionEnd assessmentStart assessmentEnd datetime regradeStart datetime regradeEnd 0 will be closed manually gt 0 the timestamp of the end of the submission phase 0 will be started manually gt 0 the timestamp of the start of the assessment phase 0 will be closed manually gt 0 the timestamp of the en
8. Things done The design of labs and videotaping of lectures for the labs are done and the videos are now hosted on YouTube We have complete the foundations and basic functions of the server side system for the MOOC and the system has already been put on a server of ECE The design and implementation of data base of the MOOC is finished for user data storage and retrieval The system behaves in accordance with the course schedule made by administrator like making assignment release at the dates specified by the schedule We also made some tests on the services we provide to see if they are available to users and if the strategies used in these services to protect user privacy are working Things need to do The instructions of lab3 and lab4 need to be polished and they are not translated to Chinese yet To test the scalability of the system the responding speed of the system with different burdens to see if the current set ups of the system are suitable for massive users and how to improve the performance of the system To make trade off between fixed course schedule for all or flexible course schedule for everyone or find a way to make a better course scheduling strategy by combining the two choices above 61 6 Reference 1 Lourdes Guardia Marcelo Maina Albert Sangra 2013 MOOC Design Principles A Pedagogical Approach from the Learner s Perspective eLearning Papers 05 2013 33 1 6 2 Michael Rowe
9. are not allowed to apply regrading If you can see your assessment grade but can t see your submission grade or any peer review details unfortunately your failed to get your grades at this time You can go to Assignment Page and request for regrades then your work will be reviewed by TA MOOC Theme by ece4760 Welcome to Join us The detail of peer review page Home Syllabus LabTable Forum Guidance Details and Comments Dimension No al Light up the seven LEDs 15 15 good 2 Let LED chase each other each one blinks about 200ms 0 25 good 3 Use the button to control the chasing direction 0 30 good A heavily commented listing of your code readable 5pt Description Score MaxScore Comment 4 d short amp clear 3pt creativity 2pt gooi A short and clear report explains how you get this done Repot should include how to light up th LEDs 6pt 5 epot should include how to light up the seven s pt 45 20 goad how to let LED chase each other 7pt and how to use the button to control the chasing direction 7pt A and B s view score page 59 Home Syllabus LabTable Forum Guidance Your Score You did not complete all your assessments your grades are not available Submission Grade Assessment Grade Final Grade notavailable notavailable notavailable If your score is not available then it is because you did not submitted your complete work or you did not complete all the assessm
10. been always following the latest development of the 123d circuits io so that we can make full use of features that can be supported by this website By the end of February of 2014 we have completed the lab content design The first lab is chasing LEDs with button control the second lab is blinking LEDs with potentiometer control the third lab is building a timer using 7 segment the fourth lab is building a pointer with servo They covered the topics including digital I O LED pushbutton voltage divider ADC PWM 7 segment display serial communication millis servo and keypad More details about each lab will be introduced in the next section Design Content In March we got down to writing lab instruction which is guidance for students to complete each assignment In order to write clear and useful instructions we carefully studied the course webpage for ECE 4760 http people ece cornell edu land courses ece4760 at first Then we searched a variety of materials about the topics we covered in labs Based on those we finished lab instructions for four labs Instructions contain three parts introduction telling users what they should do in each lab procedure telling them how to finish the task assignment amp grading criteria letting them know the specific points they can get Another important part of MOOC is the lectures We decided to make mini lectures to briefly talk about topics in each lab and each mini lecture
11. grade and assessment grade together 2 6 Theme Design The theme is used to change the appearance of the websites For our website we develop our theme based on the coller theme A theme is consists of a lot of php files including index php archive php page php single php comments php content page php content single php footer php fuctions php header php index php and style css The following describe the details of making the themes step by step Header php is used to display the title of our website and our menu bar In every pages we use lt php get header gt to get the content in header php In our header php it includes the simple title of our website and the menu bar which includes Home Lab table Discussion Forum Guidence and the Log in and Sign up Footer php is used to display the end of every page We also use lt php get footer gt to 29 include the content in footer php In our footer php we design to include the theme information and the link to the ECE4760 course website Sidebar php is used to display the side of each page However we do not need to use this sidebar we still need to write the sidebar php for further develop of our website Sidebar is consists of log in function a search menu and some other basic functions When later if some page need a sidebar we can just use lt php get_sidebar gt to get the sidebar we have written Comments php is used to display the com
12. issues should be addressed Many people use MOOC because its availability and flexibility they can get access to it whenever and wherever with a connection to the Internet It seems not perfect to keep the exact same course schedule for all of them just as what we did in the design because we will loss users by doing so thus every one having the same schedule but different offset should be a reasonable solution but under this case there would be cases that the first user who accomplish a lab may need to wait several weeks or even longer for other users to finish the same lab and then grade her work 1 Introduction 1 1 Background and motivation MOOC represents massive open online courses and there are already a lot of MOOCs out there on coursera or edX for different subjects and different people mostly they provide video lectures of the course make homework assignments and sometimes have some quiz but mostly with only multiple choice questions Because of the lack of the ability to provide experience of doing experiments in labs along with lectures it is worth noting that there are few online courses that traditionally require students to spend much time in laboratory and put theories into practice For example a course like ECE 4760 Designing with Microcontrollers could hardly be as sufficient and efficient as usual without labs Though putting hardware experiments online is challenging there are already some effort made about it 12
13. pushbutton and its pull up and pull down resistor Besides those mini lectures some other reference and reading material also be provided to help student finish their first lab We also give a simple example which is using button to control one LED Based on this example we made a mini lecture talking about its Arduino code line by line which is a detailed beginner s guide n An D2 e W R1 Led1 Ar R 220 Ohms R2 Ay R 220 Ohms D4 c jeee R3 p Aa R 220 Ohms 05 pH R4 Led4 s Aa R 220 Ohms PE D6 pf R5 Led5 Aa R 220 Ohms v pH R6 Led6 Aa R 220 Ohms R7 R 220 Ohms Led7 1013 e pe 2 tv swo Schematic of Lab1 Lab1 accounts for 20 percentage in final grade Total points for lab1 are 100 points Students can get 15 points if they can light up seven LEDs get 25 points if they can let LEDs chase each other and each one blinks about 200ms get 30 points if they can use button to control the chasing direction Since the job will be evaluated by other users we want to make sure the code is readable So a heavily commented listing of code will get 10 points Besides a short and clear report explaining how you get the lab done will get you 20 points We also set a bonus 25 points for video report since we really appreciate different types of report making this course more interesting and interactive Lab2 36 The second lab
14. the basic information of four labs into database and then begin our test procedure For the lab table students can see all four labs the instructions of labs and the start and due time They can click on start to begin their lab tour We checked all the information are same to what we exist to the database LabTable Page 47 Microcontroller Home Syllabus LabTable Forum Guidance Title Description Chasing LEDs with Button Control Instruction Blinking LEDs with Potentiometer Control Instruction Timer Instruction Pointer Instruction MOOC Theme by ece4760 Assignment Start Start Start Start Start Time 2014 05 12 2014 05 12 2014 05 12 2014 05 12 End Time 2014 06 30 2014 06 30 2014 06 30 2014 06 30 Welcome to Join us Clicking the instruction link for each lab will go to the specific instruction page here shows the instruction page for Lab 1 Home Syllabus LabTable Forum Guidance Read the description for Lab 1 Chasing LEDs with Button Control Chasing LEDs with Button Control Introduction You will build seven chasing LEDs with a button controlling direction on the virtual breadboard When the button is pushed LEDs start blinking from right to left When pushed again the chasing direction changes First you need to know how to use the virtual Arduino and breadboard on the website http 123d circuits io Procedure 1 Learn how to use 123D Circuits http www instructables com id Zero to Breadboard Simul
15. the static pages which don t need to interact with database Home Page Microcontroller Home Syllabus LabTable Forum Guidance Home ECE4760 Introduction by Bruce MicroController Design Welcome to the microcontroller design course on the MOOC In this course we are going to use Arduino to do four projects on the internet through which you will learn how to use microcontroller and have a lot of fun Arduino is awesome open source platform microcontroller which is widely used for doing electronic projects 45 Syllabus Page Syllabus Microcontroller Design Course on the MOOC Course description In this course we are going to use Arduino to do four projects on the internet through which you will learn how to use microcontroller Arduino is awesome open source platform microcontroller which is widely used for doing electronic projects In this MOOC course you don t have to buy any hardware You can totally finish the four projects on the internet thanks to this amazing website 123d circuit io which provides free simulation environment for you For each lab there are several mini lectures to introduce the related knowledge you need and we also provide detailed instructions in our website If whether you are the beginner who never used electronics before or you are a veteran who has been working with other microcontrollers this is a great course for you Course Objectives This MOOC course is to familiarize user
16. upload the link to a YouTube video that describe your solution so that others can better understand it As our grading system is based on peer review you will also need to assess other 4 guys homework to get your homework graded You need to finish all the assessments before the assessment deadline You should click the assessment button after submission deadline and download the grading criteria read it carefully Then choose one work of others to assess Give credits to every part according to the criteria and write down any comments you want You can save the assessment anytime by submitting it Next time when you go to this assessment you will see all the information that has been saved In this way you can change your assessment anytime before the assessment deadline After the assessment deadline all the assessments will be analyzed then you can see your score As there is possibility that some people drop course half way or forget to assess others work if less than two people assess your work you won t get a score If you don t see your score you can request to have it re graded by the Teaching Assistant before the re grading deadline You can also discuss any problems you encounter during lab with other students in your discussion forum Each lab has a discussing section You can also give your precious suggestions in the suggestion section to help us improve website Address of the MOOC en ec ece4760mooc ece cornell edu 63
17. used in microcontroller projects which have gears and a shaft that can be precisely positioned at various angles We provide two example circuits to show how to control servos using Arduino servo library And an example about building and detecting keypad is provided After carefully studied those examples students should be full prepared to work on lab4 Schematic of this lab is shown below We provide schematic on lab instruction to help students build the circuit 41 Schematic of Lab4 Lab4 accounts for 30 percentage in final grade Total points for lab4 are 100 points Students can get 35 points if they successfully build a 3 3 keypad and work well get 25 points if the keypad can control the servo properly get 15 points if they can accomplish the function of key 1 6 and get 15 points if they achieve the reset and sweep function with key7 9 Code and report account for 20 points as always We also set a bonus 25 points for those who add new function to the pointer We are expected to see students show their creativity in this lab 3 2 Making Mini lectures Lectures are traditional parts of MOOC In our MOOC course we provided 19 video lectures in total Four lectures are given by our guest lecturer Prof Bruce Land and others are given by Yuanyuan Gong Those videos contains of demo for each lab introduction of knowledge that needed for each lab and explanation for some examples There are 4 videos for labland 5 videos for lab
18. work again and again or a robot just try to fill up our space will just fail In the submission part we design to let student submit four things the youtube video link they will make a short video to describe what they did including some difficult part they cannot describe by words in their report the 123Circuits link which is used to test their code and check their circuit the 123 Circuits has the detail explanation in part 3 3 their report which contains the information our student s work and information for help grading and the code which contains the code students design The second phase is assessment phase In this phase you can assess other s work Once you complete your work by the deadline of this assignment you will be assigned to assess four other submissions if there are only 4 or less submission you will be assigned less By click on the link button you can go assess their work And there will also a hint for you describing which assessment you have done and which you have not Also there is a link to instructions describe how you should assess other s work This peer review design can help student learn more about the lab they can see how other students did the same thing where they did better or using a totally different method We design this assessment phase to be anonymous which means students do not know whose work they are assessing This decision will help protect students privacy and prevent discriminat
19. 1 67 very lax 1 00 We can see an example following Min grade Max grade Best Peer difference Dimension 1 1 4 4 3 0 56 Dimension 2 1 4 3 4 0 56 Dimension 3 0 10 5 5 l Dimension 4 0 10 6 6 1 Dimension 5 0 10 8 8 1 subGrad 68 42 65 79 assessGrade 100 00 71 35 form 1 As for user roles We decided to design two roles one is normal student and the other is TA The student role is used for student to enroll the class submit their work assess others work see your grade and view regrade The TA role is used to assign the assessment tasks including who will assess which four assignment and each assignment will be assessed by which four people When the submission deadline is coming a TA will click the assign button to do this procedure Another button we design for TA is used for compute the scores When the submission deadline is coming a TA will click the compute button to do this procedure In the future another professor role will be perfect for this system It will be used to modify some lab instructions including grading details and something like that 2 3 2 Security Concerns There are several security concerns of our website One is file permission security and the other is database security 15 As the website is running in the user of apache in redhat OS the root directory and subdirectories should be readable and executable by apache but not ot
20. 1 in table Assessment with corresponding assessmentID Also set the value of submGrades to the total cumulative grades of each dimension of this assignment in table Assessment with corresponding assessmentID 2 5 2 5 Data flow in grading phase When assessment deadline comes it comes the grading phase Only the students who accomplish all the assessments assigned to them can get their grades caculated That means the records in Assessment table whose submitted value is equal to 1 rather than 0 When grading start time arrives either of the TA can click the calculate the grade button to assign the assessment System will calculate the submission grades first and then the assessment grades and updated them in table Submission After this students can go the view grade page to see their scores as well as details and comments of peer review Just like what system do in assessment phase first it will check whether the grades of this assignment has been calculated or not based on the value of calculated in the Assignment 26 Table with specific assignmentID If the value is 0 rather than 1 that means the grades of this assignment has not being calculated The system will do the calculation of submission grades based on the grades other reviewer gives Then do the calculation of assessmentID based on the grades this user gives to other peers and the corresponding submission grades other peers get In order to calculate each user s
21. 2 and each mini lecture lasts about 5 42 minutes Here we have to thank Jessica Stephenson for lending the video camera to us so that we can make the mini lectures After taping the video we used Corel video studio to edit it then Prof Bruce Land uploaded it to his channel on YouTube Here is the link https www youtube com playlist list PLKcjQ UFkrd4IWDmLnASIftKtHV ekO0qk2 We embedded those videos in our website so students can watch them when they read the instruction for each lab Due to limited time we only provided two videos for lab3 and lab4 To make up for that we gave more example circuits for lab3 and lab4 to help users understand the key points We also made a Chinese version for those videos since Chinese students are really large populations Unfortunately YouTube is blocked in China so we decided to put the Chinese version on Youku the most popular video website in China and advertise it in Weibo and Renren like twitter and Facebook in US In this way more and more students in the world will benefit from our MOOC course 43 4 Test and Debug 4 1 Method 4 1 1 Static test We first test our website statically we just build the whole structure of our websites including all pages we needed to implement our basic functions which is discussed in the part 2 2 We basically test and mediate the front end code to make every page looks simple easy and beautiful Then test every page to make sure th
22. 3d circuits io is now leading in this aspect and providing free service to open designer which makes it a perfect complement to a MOOC for courses like Designing with Microcontrollers Hence in our MOOC there are instructions to teach students how to use 123d circuits io to do experiments and labs with circuits and microcontrollers and how to submit their works done on 123d circuits io to the data center of our MOOC One effective way to stimulate people and make them do better on their job is grading we also want to give users of our MOOC feedbacks of how well she comprehends the content of the course and how good her skills are when doing labs Hence we decided to incorporate a grading subsystem into the MOOC But since MOOC means massive open online course it is a good assumption that there will be too many users and too many homework submissions that we can not find enough graders and teaching assistants to make these feedback on time and because grading criteria for a lab is much more complex than multiple choice questions it may not be possible to use machine grading for the MOOC So with all these considerations we choose peer review to take up the job of grading and commenting which means except for doing their own homework and labs students also need to grade their peers work and make comment on them based on the instructions and grading criteria provided with each lab 1 2 The main content and goal of the project Our MOOC itse
23. 53 7861328125 kB 19a1de167122a18af369c749f4e40a48report pdfhas been uploaded again click here to view your code Your Youtube Page Your 123Circuits Page We also tried to upload the file doesn t meet the qualification in the submission phase including the file type and the file size We have defined the file size is no more than 200KB The report file should be in pdf and the source code file should in zip Submit your work here Please submit your work before deadline Youtube Video Link 123Circuits Link Upload your report pdf Choose File source zip Upload your code zip Choose File no file selected Submit Get information below ee ee ee MES UNDC CODD CUESTA ee We only accept pdf file for your report You did not select the zip file for your code Empty Input for Youtube Link Empty Input for Youtube Link Similarly we tried to submit the invalid website links which are not start with http 50 Submit your work here Please submit your work before deadline Youtube Video Link https www youtube com we 123Circuits Link www google com Upload your report pdf Choose File report5 pdf Upload your code zip Choose File source zip Submit Get information like below Upload 19a1de167122a18af369c749f4e40a48report pdf Type application pdf Size 53 7861328125 kB 19a1de167122a18af369c749f4e402a48report pdfhas been uploaded again
24. Gong From the lab table you can also see the start time and deadline of each lab so you can decide which lab session it is now so that you will be able to engage in the assignment You must submit your solution to the assignment before the submission deadline if you want to get scores For each lab you should upload at least the source code 123dcircuit link report You have the option to upload the link to a youtube video that describe your solution so that others can better understand it As our grading system is based on peer review you will also need to assess other 4 guys homework to get your homework graded You need to finish all the assessments before the assessment deadline You should click the assessment button after submission deadline and download the grading criteria read it carefully Then choose one work of others to assess Give credits to every part according to the criteria and write down any comments you want You can save the assessment anytime by submitting it Next time when you go to this assessment you will see all the information that has been saved In this way you can change your assessment anytime before the assessment deadline After the assessment deadline all the assessments will be analyzed then you can see your score We then test the student role subscriber we test every pages following the lab table page we have written according to this order lab table upload assessment grading 2 re grade We insert
25. MOOC for Microcontroller Design Course A Design Project Report Presented to the Engineering Division of the Graduate School Of Cornell University In Partial Fulfillment of the Requirements for the Degree of Master of Engineering Electrical by Mingming Dai Junhao Dong Yun Hao Yuanyuan Gong Yize Li Project Advisor Dr Bruce Land Degree Date January 2015 Contents PS UU cae cated ead ace haa Date coheed ted ata a aceasta cid te leans 1 Ex c tive SUMMAT essnee tdi Dd Gun erry PPro 2 T TBEPOUDEDOH siioni a o aa E 3 1 1 Background and motpvabIOTLsucos et ert teniente tede ros apium recie 3 1 2 The main content and goal of the project esee 4 1 3 Thestr ctureof the TODOF suo eie unitate ea ada uis 6 EP ns RT corren T a 7 2 1 Basic design of using what kind of technology s 7 21A Why PHPEMYSQ RANT TAS IUS 7 20 7 Why VU ssa eae aaan 7 PARV Ries 7 23 The Design De6ISIODS ada dsa d adn a aa aaa a i Ra 9 2 3 1 The design consideration sucer scettr ttt HEU E uddo tuut eH duo etd 9 2 3 2 MUL LODCOEBS eiiis titi oon oerte rnit ite Cua Mea D M LC DE 15 24 NP NIC m 16 2 4 1 Database overall structure epe rasa eth nad pALUR beater 16 231 2 Detail description of database uu iiir etae i Us tented 17 2 5 The data flow of Sy SU M qa i cate rio asa i onu Du galas 21 2 5 1 The overall data flow Of system nennen ertt eterne bra nbn kpnpah 21 2 5 2 The detail description of the data fl
26. Vivienne Bozalek Jose Frantz 2013 Using Google Drive to facilitate a blended approach to authentic learning British Journal of Educational Technology 06 2013 3 Lyubomir Serafimov 2012 HTML5 Support in Mobile Learning Tools In proceeding of International Scientific Conference eLearning and Software for Education At Bucharest Romania Volume 2 4 Kamil Kopecky 2014 New Trends in the Development of Mlearning with Focus on Tables and Other Mobile Devices The 10 International Scientific Conference eLearning and software for Education 04 2014 62 Appendix A User Manual Dear visitor and student this is a user manual to our website As a student you should first have a look at Syllabus to get an overall understanding of this course After having a basic view of this course if you decide to take this course you could go to the lab table page In the lab table page you can click the instruction link and see the detailed description of the lab corresponding materials resources and video lectures from Professor Bruce R Land Yuanyuan Gong From the lab table you can also see the start time and deadline of each lab so you can decide which lab session it is now so that you will be able to engage in the assignment You must submit your solution to the assignment before the submission deadline if you want to get scores For each lab you should upload at least the source code 123dcircuit link report You have the option to
27. ally calculated the grades for each qualified user then is one situation when user is allowed to request for re grading If records of this user has the submGrade equal to 0 and has the assessGrade larger than 0 that means he or she complete all their assessment tasks but fewer then 2 peers has reviewed his or her work thus this user is qualified to request for re grading The system will check if the user is qualified for re grading If the user is qualified and has not requested before by checking the value of regradeID of specific records in table 28 Submission system will randomly choose a TA and put that TA s userID into regradeID of the records in Submission Table At the same time insert a new record in table Assessment with the submissionID and regraderID just like what system do when assign the table during assessment phase of peer review Basically system will do the exact same thing with the database like the former peer review procedure first TA can view the assessment assigned to them for each assignment then they give the scores and comments based on rubrics of grading form The only difference is that after TA submits the assessment and system update the submGrade value in the Assessment table also update the submGrade in Submission table with the value of submGrade in Assessment table The score that TA gives is the submission grade of this student Thus the students who request for re grade can view his or her submission
28. als This MOOC course is to familiarize users who interested in electronics with the basic electronic knowledge and functions of microcontroller without buying any hardware After taking the course students are expected to be able to design their own projects with Arduino fulfilling their interesting and fancy ideas On the other hand since the website 123d circuit io is still under development there is limitation of its online compiler and electronic components library Under this circumstance my job is to make full use of its compiler and components to design interesting labs through doing which students can learn the use of Arduino as much as possible The first two Labs aim to let students know the basic stuff of Arduino and the topics include digital I O analog I O LED pushbutton etc The last two labs are more difficult requiring students to combine what they learned from first two labs which aims to give students an interesting experience of designing 3 1 2 Design Process ECE 4760 is a lab based microcontroller design course which uses hardware and software techniques to teach students a variety of design skills and experience of handling large projects The key to delivering such a course on MOOC is to build a virtual lab so students can do labs on their own computers without buying any hardware At first we came up with three ideas The first one is to find an existing cheap or free software which can provide an integrated s
29. any I O register can be assigned a value as input to be simulated and the result the output of I O register can also be logged into a file We planned to use the output file to control the circuits in LTspice However we had some difficulty in writing the stimuli file Timing problems often happened and simulation stopped suddenly We tried a lot but still could not figure it out When we were struggling with the stimuli files Prof Bruce Land told us he found a website support integrated online simulation for Arduino which was really good news for us The website is 123d circuits io I did some research about this website and I found it only supported very basic functions of Arduino and the components in its library were also limited Then I contacted the team working for 123d circuits io They said the website was still under development and more features would be released in the future After discussion Prof Bruce Land we settled on our final plan which is to design 33 Arduino labs on 123d circuits io and include its link on our website Since the microcontroller used in ECE 4760 is Atmega 1284 while the Arduino Uno used in 123d circuits io is based on Atmega 328 we have to modify the lab assignments given by ECE 4760 to fit into our MOOC Considering the limitation of 123d circuits io we designed four labs aiming to teach students certain functions of Arduino which are commonly used in Arduino projects At the same time we have
30. art to review the assessment now click here to view the code click here to view the report Youtube Video Page 123Circuits Page 1 Light up the seven LEDs Score 15 15 Comment Good 2 Let LED chase each other each one blinks about 200ms Score 25 25 Comment Great 3 Use the button to control the chasing direction Score 25 30 Comment Good 4 A heavily commented listing of your code readable 5pt short amp clear 3pt creativity 2pt Score 5 10 Comment good 4 5 A short and clear report explains how you get this done Repot should include how to light up the seven LEDs 6pt how to let LED chase each other 7pt and how to use the button to control the chasing direction 7pt Score 15 20 Comment Submit 52 If the score we put in is bigger than the maximum value of each dimension or is not a number Ie Fe RA RSS Your entered pdints must be number and below max points and larger or equal to zero When students done the assessment and the assessment deadline is coming then comes the grading phase TA will go the lab table of TA and click the button to calculate the grades Microcontroller Home Syllabus LabTableForTA Forum Title Chasing LEDs with Button Control Blinking LEDs with Potentiometer Control Timer Pointer The Detail Page for assignmentl TA Detail Page Assign the assessment Caculate the grades Guidance Description Instruction Instruction I
31. assignment is to build ten LEDs with a potentiometer controlling the lighting numbers and brightness A button or slide switch is used to set up two modes In one mode when you tune the potentiometer the number of lighting LEDs will change In other mode when you turn the potentiometer the brightness of ten LEDs will change This lab is designed to let users learn the ADC and PWM function in Arduino and the use of potentiometer zanno H Schematic of this lab is shown below We provide schematic on lab instruction to help students build the circuit Students are expected to know the ADC and PWM functions in Arduino and use of potentiometer after this lab We first give a mini lecture about analog and digital signals and difference between them which is basic concepts we need to clarify for beginners Then we talk about ADC which is analog to digital converter The main function of ADC is to read analog inputs into our system and convert them to digital numbers so the microcontroller can process them Another important concept PWM or Pulse Width Modulation which is a technique to get analog results with digital method is explained by guest professor Bruce Land And he also talks about how to implement it in Arduino system Potentiometer is widely used to get any voltage between supply 37 voltage and ground Students should know how to use it very well when finishing lab2 We also give an example which is using potentiometer to contr
32. ation ALLSTEPS http www instructables com id EZGYWF1HKJTCHMZ 2 Learn the basic of Arduino MADE IN ITALY e url DL d Clicking the start link for each lab will go to the specific assignment page here shows the assignment page for Lab 1 48 Home Syllabus LabTable Forum Guidance Let s start Lab 1 Chasing LEDs with Button Control Lab 1 Chasing LEDs with Button Control Start Instruction Upload Files Assessment Assess Other s Work Grades View Grades Regrades Request Regrade Regrade Result In the upload part we tested if we can upload four things and if the data in database is correct We also tried some corner case to test if we can upload invalid things and if we continue upload several times which version will be saved finally Submit your work here Please submit your work before deadline Youtube Video Link https www youtube com we 123Circuits Link http 123d circuits io Upload your report pdf Choose File report5 pdf Upload your code zip Choose File source zip Submit You can view your uploads using the links below You have already submitted all the required file Your submission is completed click here to view your code click here to view your report Your Youtube Video Page Your 123Circuits Page 49 Get the information below Upload 19a1de167122a18af369c749f4e40a48report pdf Type application pdf Size
33. bination as proof We use it for data storage for public content user data and super user data Public data is accessible to all like instructions and grading criteria of labs user data consists of different kinds of data with varied level of privacy some of them is only known to the user itself like password while some is accessible to others but not all of them like users submissions of code of a lab with very little of them is available to all like usernames Super user data is much like user data which means a lot to the safety of the MOOC and is needed to handle with great precaution The grading subsystem is an indispensable component inside the whole system of the MOOC it should be intelligent convenient effective and safe The role of grading is important in the process of learning it is a reflection of the quality of the process of learning Hence we need the grades and comments of users works to be precise and instructive but peer review is a complex method with many things not under control of the grading system extra rules and constraints needed to be enforced in order to prevent bad behaviors like degrading with intention retaliation for a bad score etc the grading subsystem heavily relies on the database of the system to grade on others works one need to get it from the database and then need to put her comments and grading for others back into the place in the database More details about how the database is
34. c software Although we discard all the exist pages a basic wordpress provide and write our own page wordpress s thousands of plugins and widgets plus some exist functions it provided is useful for our project 2 1 1 Why PHP MySQL With PHP we can connect to and manipulate databases and MySQL is the most popular database system used with PHP PHP MySQL is the most mature stable and secure WEB develop technology It is widely used in most popular websites PHP combined with MySQL are cross platform you can develop in Mac or Windows and serve on a Unix platform From our group s view This is our first time to develop a websites PHP MySQL has the most mature reference material to look at and when we encounter some problems or bugs we cannot figure out we can easily find the solutions online 2 1 2 Why Wordpress WordPress is web software for people to create a beautiful website or blog It is first used as just a blogging system but has evolved to be used to full content management system and has thousands of plugins and widgets which can help us to implement some great functions which we have not enough time to complete such as discussion forum part 2 2 High level Design This system is designed for Cornell course ECE4760 MicroController Design on MOOC platform This system will be used by thousands of students who are interested in this course from everywhere around the world Our target is to develop a platform f
35. d of the assessment phase O e 1 assessment has been assigned a 0 grades has not been calculated 1 grades has been calculated a 0 will be started manually gt 0 the timestamp of the start of the regrade phase o 0 will be closed manually 70 the 18 timestamp of the end of the regrade phase assignment end time the path of the d ipti fth ject assessIntroPath text NULL E Deu Iden stored in server Table Submission This table keeps the information about the submission including the aggregation of the grade for submission grade for assessment and final grade Both grade for submission and grade for TA can override assessment if student do not receive their grades when grading session ends Final grade is always the sum of them All grades are stored as of 0 100 submissionID int 10 Auto numbered seria assignmentID int 10 he id of the assignment instance userID int 10 The author of the submission Grade for the submission calculated as Number average of the peer assessments The grade gradeForSubmit NULL isa number from interval 0 100 If NULL 10 5 Me then the grade for submission has not been aggregated yet finalGrade niri NULL Final grade subm amp assess regraderID int 10 NULL The id of the TA who has regraded the work Grade for the assessment The grade is a number number from interval 0 100 If NULL then ForA NULL pradeHopasse
36. d on each submissionID we get get the final submission grades the system just calculated from the Submission Table By 27 calculating the variance between those two submGrades and considering the assessment factor stored in Assignment table the system can calculate the assessment grades for the user and update it to the corresponding records in Submission table After all the calculation set the value calculated to 1 in Assignment table with corresponding assignmentID When students view their grades system will first get the records from the Submission table with specific assignmentID and userID If records of this user has the assessGrade equal to 0 and has the submGrade larger than 0 that means he or she did not complete all their assessment tasks thus both the assessment grade and submission grade are not available to this user If records of this user has the submGrade equal to 0 and has the assessGrade larger than 0 that means he or she complete all their assessment tasks but fewer then 2 peers has reviewed his or her work thus this user can see his or her assessment grade but submission grade is not available to this user This is the only situation when user can request for re grading If both the value of assessGrade and submGrade of this record is larger than 0 this is the normal situation the user can view his or her assessment grade and submission grade 2 5 2 6 Data flow in re grading phase After system automatic
37. e the user submit their work the system will check if the record corresponding to the assignmentID and userID has the two path and the link to 123dcircuit written which means the user has complete their work it will set the submitted value of this record to 1 Only those who complete their work has can participated in the next phase that is the assessment phase 2 5 2 4 Data flow in assessment phase When submission deadline comes it comes the assessment phase Only the students who submit their work completely can take part in this phase That means the records in Submission table whose submitted value is equal to 1 rather than 0 When assessment start time arrives either of the TA can click the assign assessment button to assign the assessment Students need to complete all the assessment tasks assigned to them before the assessment deadline to get their scores Firstly the system will extract the records in Submission table whose submitted value is equal to and shuffle them This is to ensure that the distribution of assessment will be randomly Next it will check the corresponding record in Assignment table using assignmentID to see if the assessment of this assignment is being assigned before to prevent double distribution just see if the value of assessmentAssigned is 1 If the assignment has not been assigned before for each shuffled records extracted from the Submission table get its userID as reviewerID and the follow
38. eir functions works well In this step we did not build a relationship between each page We just insert to the database some data which is required to access from the database and then test if we can get the expected data we want And insert the information to the database and then use manager identity to see if the database has the data we have inserted in 4 1 2 Dynamic test In this step we build the relationship between each page and do this in the order of the whole procedure of one assignment We first insert into the database the basic lab information and then from the procedure we have discussed before test them pages by pages to find the bugs 4 2 Details of test each stage Here we will mainly discuss the dynamic test we have mentioned in the above part As the data flow we have discussed before we have to the test step by step so that the database will complete page by page And this is also the way to simulate what will really happen when a lab is assigned to students 44 Because we design to assign each student four submissions to assess we create 5 student role to test this And we also need TA to assign the assessment calculate the score and regrade so we also create two TA accounts Finally we create 7 users to test the whole system they are as following yunhao administrator yun subscriber hao subscriber goodluck subscriber haoyun subscriber TA1 contributor TA2 contributor First we test
39. ension id in one of the grading strategy tables This table contains the information of the evaluation elements definitions of Rubric grading strategy forms 20 int 10 EEEEN auto numbered serial int 10 dimension int 10 P The max grade of this part description text medium __ Simple description of the criteria int 10 EEEEN Which assignment it belongs to 2 5 The data flow of System 2 5 1 The overall data flow of system We have already stored the related information of the settings of our four assignments in table Assignment and Criteria Table Assignment is used to generate the LabTable for students and TAs and define settings of each assignment including the title of each assignment the start and end time of each phase the factors for grading algorithms the number of assessments each students need to complete and so on Table Criteria is used to generate grading forms for students to assess other peers work including the details of rubrics and max points of each rubric Once a user register in our website all his or her related information will be stored in table User and a userID is generated automatically in serial for the user UserID is vital since we using userID to recognize and extract the related records of one specific user During the submission phase students can see the instruction for the specific assignment and complete their work Students must submit their solution before the submission dead
40. ents assigned to you In this case you are not allowed to apply regrading If you can see your assessment grade but can t see your submission grade or any peer review details unfortunately your failed to get your grades at this time You can go to Assignment Page and request for regrades then your work will be reviewed by TA MOOC Theme by ece4760 Welcome to Join us C s view score page Home Syllabus LabTable Forum Guidance Your Score You did not get your submission grade since less than two peers have reviewed your work You can go to Assignment Page and request for regrades then your work will be reviewed by TA Submission Grade Assessment Grade Final Grade not available 18 00 not available If your score is not available then it is because you did not submitted your complete work or you did not complete all the assessments assigned to you In this case you are not allowed to apply regrading If you can see your assessment grade but can t see your submission grade or any peer review details unfortunately your failed to get your grades at this time You can go to Assignment Page and request for regrades then your work will be reviewed by TA C request for re grade 56 Home Syllabus LabTable Forum Guidance You have already request before You can contact TA by email TA1 gmail com Unqualified user to request for re grade Microcontroller Home Syllabus LabTable Forum Guidance Sorry Y
41. f submission grades first we get the records from Submission table with corresponding assignmentID and with submitted value equal to 1 Then for each of the submissionID get the assessment records that they have That means get the records from Assessment table with that submissionID and submitted value equal to 1 If the number of the records is larger than 2 that means more than two peers has accomplished the assessment of this submission Then use the submGrades from those records to get the value of the submission grades of this submission based on the algorithm introduced before Update the submGrade in table Submission with corresponding submissionID to the calculated value If the number of the records get form Assessment table is smaller than 2 then system cannot calculated the submission grades just set the submGrade in table Submission with corresponding submissionID to 0 Based on the submission grades the system will then do the work with assessment grades First system will get the submGrades and submissionID from both Assessment table and Submission Table where the reviewerID of the Assessment table is equal to the userID and the submissionID of two tables are equal and the submitted value in Assessment table is equal to 0 with corresponding assignmentID This is to get the information of each assessment this user has accomplished including the total grades he or she gives and the corresponding submissionID of this assessment Base
42. four other peers four is assessment factor value we store in assignment table And then we will use an algorithm to compute the score However if only two or less students have assess a work this work will not be computed automatically we will not display the score to this student and will let him do the re grade procedure In this case you can see your assessment grade if you have done all of your assessment work Student did not complete all his assessments We only allow students who done all their assessment to see their score This will give student more motivation to assess others work By this way we can decrease the possibility of situation In this case you cannot see your assessment grade The last phase is regard phase In this phase students can request regrade their work However not all students are allowed to request In the phase 3 only situation 2 can request students which means if you have not complete the assessment work or you have 12 not submit the complete document And if students are not satisfied with their score we do not allow them to request regrade Since this is a MOOC Massive Open Online Courses course website it is used for maybe thousands of students if all students are not satisfied with their score our TA will be stressed out For this kind of reason we are not allowed the formal situation regrade request in normal university course We will give a hint that you are not allowed to regrade
43. her users So the mod of file should be 755 For the wp content directory as it will be used to contain uploaded files so it should be writable by User apache The mod should be 775 The directories and files are all in the apache group As SQL Injection is a very common and serious security problem our system use the robust prepare function provided by WordPress Database library to protect this For every database query we use the wpdb gt prepare function which parameterizes the query so that no harmful parameters will be executed This is quite robust and proved to protect against most SQL injections 2 4 Database Design 2 4 1 Database overall structure From the figure above we can see that our database contains 6 tables Table User keeps the information for the user of our website Table Assignment keeps the information about the assignment instances and their settings Table Submission keeps the information about the submission including the aggregation of the grade for submission grade for assessment and final grade Table Assessment keeps the information about the made assessment and automatically calculated grade for it Table GradingPoint contains the information of how the reviewers filled up the grading forms given submission grades and comments Table Criteria contains the information of the evaluation elements definitions of Rubric grading strategy forms 16 Assignment assignmentlD i
44. hs to the files and links to the 123dcircuits and youtube video Reviewer can follow the link to review the work and fill the grading form with score and comment based on each rubric The grading form is generated using the information stored in Criteria Table After user pick one assessment task complete the grading form and submit his or her review work several records will be inserted or updated in table Gradingpoint If the reviewer has never submit this assessment before then the system will inserted several records into table Gradingpoint each with specific assessmentID dimensionID the 25 points reviewer entered and the comments reviewer gave Each record will generated will generated with an automatically serial gradingPointID If the reviewer has reviewed the assessment and submitted it before which means the reviewer is resubmit the assessment this time The system will find the corresponding records in table Gradingpoints with the assessmentID and dimensionID and overwrite the specific part that reviewer resubmit this time After updating the Gradingpoint table the system also check whether this assessment is completed by checking the total number of records in Gradingpoint table with specific assessmentID and the total number of the records in Criteria table with specific assignmentID If those two are equal it indicates that the reviewer has accomplished all the dimension in this assessment Set the value of submitted to
45. id the lab and how well they assess others works If they submitted their work and done all the assessment but still have no score to view they can ask for regrade As for TA we design a TA page for them to easily allocate whose will assess which four assessments and whose submission will be assessed by which four students And when the assessment phase ends TA can easily compute the final score for every student review give based on score and wirte comment submit the work review several oe p rs work grading is done A get youi0 al score grading algorithm scores and comments from several The basic procedure of one lab assignment 2 3 The Design Decisions 2 3 1 The design consideration During the design stage of our projects we have made a lot of decisions are suitable for this specific ECE4760 Micro controller course Here are the details ordered by the time of the whole procedure of one semester For the home page students can see a introduction video to this course from Yuanyuan to learn the basic structure of this course and a video from professor Bruce Land to explain the tools we will use in this course This will give students an overall description and they can decide whether or not they would enroll For Syllabus page student can get some basic information such as course description objective lecturer the simulation website they will use
46. illis function avoiding delay Schematic of this lab is shown below We provide schematic on lab instruction to help students build the circuit We want students to learn the use of segments serial communication and millis in this lab which are very useful when they come to large project design The 7 segment consists of seven LEDs a b c d e f g arranged in a rectangular form looking like number 8 Lighting up a particular set of LEDs can display a certain number We provide detailed reading material to help students fully understand the working principle of segments Serial is used for communicating between microcontroller and computer or other devices In this lab we use the serial to send a command to Arduino board controlling the display of segment Another important thing students need to know is using millis function is better than delay since delay stops the CPU for a certain number of millisecond nothing in code can run during the delay time We also provide three simple examples about serial communication and segment display to help student know the syntax and logic 99 Ky y L1 R8 R9 Common Cathode Schematic of Lab3 Lab3 accounts for 30 percentage in final grade Total points for lab3 are 100 points Students can get 35 points if they can display a number on segment controlling by the serial communication They can get another 25 points if the segment countdown as a timer and 15 p
47. imulation environment for both CPU of A Tmegal284 which used in ECE4760 and peripheral circuits connected to microcontroller Our second idea is to hook up the Atmel Studio which is a free platform for debugging and compiling Atmel AVR microcontrollers to LTspice which is a free circuit simulator We also planned to design several peripheral simulators for keypad 32 LED and LCD which often used in microcontroller projects and connect them to Atmel Studio or LTspice for complete simulation The third idea to let users buy their own hardware and we give the lectures and instructions After they finished the labs they have to make a video recording what they do and upload to our website for demo and evaluation That was our last option because buying hardware is against our original purpose of delivering a lab based course on MOOC It turned out that we did not find an existing software can provide integrated simulation platform for both CPU of microcontroller and peripheral circuits So we had to give up the first idea Since the third one was our last choice we planned to start with the second idea which is hooking up Atmel Studio to LTspice We have to say that was a huge plan In order to connect them IO ports of the microcontroller are the key part since it is the connection of the microcontroller and circuits At first we worked on the Atmel Studio part We tried to write stimuli files for the CPU simulator In the stimuli files
48. ing n records of submissionID as submission ID insert n new records based on the reviewerID and submissionID to the Assessment table 24 Thus generate n assessment tasks for each user who submitted their complete work before The number n is the number of assessment get from Assignment Table If the total number of the records extracted from the Submission table is smaller than n just set n equals to n 1 in order to make sure everyone can be assessed by other peers rather than themselves After doing this set the value of assessmentAssigned in corresponding record Assignment table to indicate that this assignment has been assigned This is the data flow for assign the assessment for each user After assign the assessments students can view their assessment tasks in assessment page by clicking each assessment button generated from the records in assessment table whose reviewerID is equal to the userID they will go to the grading form page to complete the assessment using the assessmentID from the records mentioned before The system will first check the userID with the reviewerID in the assessment table to make sure the user is qualified to review this assessment In order to review this assessment reviewer need to get access to the links and files report and code submitted before the system will use the submissionID get from the records in the Assessment table to find the corresponding records in Submission table and thus get the pat
49. ion assessment The detailed peer review decision will be discussed later in this part When click on one assessment you are assigned you can go to the Grading page In this page you can download the code and report you need to assess and see the youtube link and 123circuits page We design a form for users to complete which will be convenient for both users and us We divided each assignment for several dimension for each dimension we set up a total score and give student a criteria for each dimension to judge how much this dimension should be scored Students only need to give the dimension 11 score and write some comments explaining why you give this specific score The third part is grade phase In this phase you can see your grade Students in following situations cannot see their grades The grades are consisted of two parts one is submission grade and the other is assessment grade Submission grade shows how good your lab work is and assessment grade shows how you assess others work The final grade is combined of two parts and the criteria of the assessment grade will be discussed later in this part They did not submit the complete documents for the certain lab Students are supposed to submit all four things we discussed above lack of each part can lead to failing to see the score Less than two peers have reviewed student s work We assign each student four submission to assess And each user s work will assess by
50. is about 5 7 minutes This job also started in March more details about making mini lectures are in the section 3 3 34 3 1 3 Design Content Labl The first lab assignment is to build seven chasing LEDs with a button controlling direction on the virtual breadboard When the button is pushed LEDs start blinking from right to left When pushed again the chasing direction changes This is a basic lab which aims to guide students learn the use of virtual Arduino and breadboard on the website 123d circuit io and know basic functions of Arduino To help students get started we found two video tutorials on 123d circuit io which clearly introduce how to build circuits on virtual breadboard how to compile the Arduino code and run the simulation We also provide basic information about Arduino Uno and programming language syntax Schematic for this lab is shown in the following We want students to learn the concepts of digital I O LED and pushbutton in first lab Digital pins on the Arduino can be configured as either inputs or outputs Labl lets students experience the function of the pins in both modes LEDs are widely used in microcontroller projects which are very useful for debugging and many other purposes LED cannot be directly added on a circuit 25 without something to limit the current Thus we give a mini lecture about working principle of LED and its current limiting resistor We also provide a mini lecture talking about
51. is not appropriate or the user is not login in corresponding message will show up to remind users In the assignment page students can view the instruction and complete their work After completing the work students need to submit their solution to the assignment before the submission deadline For each lab they need to upload their source code zip file report pdf file 123dcircuit link youtube link in the upload page After clicking submit there are two things need to be done Firstly the system will upload the two files to the server if they meet the requirements no bigger than the maximum size There is a folder named uploads in our server that store all the users upload files Each user will have a subfolder named with their encrypted userID and in this subfolder stores all the files uploaded The path to those files will be recorded to put into the database later Secondly a record of this submission will inserted to Submission table if this is the first time for the user to submit solution or updated to Submission table if the user has already submit solution before This can allow users to resubmit their work This record uses assignmentID and userID as foreign key and automatically generate a submissionID in 23 serial The youtube video link and 123dcircuit link the user input will directly store into this record and the path to the report file and the source code file will stored to the record either Each tim
52. k and give a email address of this TA for him to contact Now we use this TA s account then we can see the assessment after TA have done the assessment student C can see his re grade score comments and detail We did the same thing in the assessment phase when assess others works student have to suggest a score of each dimension we defined that the score given must no bigger than the max point and can only be numbers When we tried these error behaviors we got the corresponding hint information In our system there are two parts that students must submit something The first is to submit their work and second one is to submit the assessment form We defined to keep only one copy of these and when new submissions are made we delete the old copies As test part we submitted several times and it only keeps the newest copy As for the 54 assessment part students can complete some part of one assessment and once submit the database will only record the part they filled and other parts of this assessment will remain the old version D s view score page normal situation Home Syllabus LabTable Forum Guidance Your Score e Submission Grade Assessment Grade Final Grade 64 00 6 00 58 Peer Review 1 Peer Review 2 Peer Review 3 Peer Review 4 If your score is not available then it is because you did not submitted your complete work or you did not complete all the assessments assigned to you In this case you
53. lf consists of online lectures and instructions homework and labs and the server side system that hosts the materials or the links to the materials needed for the course and carries out services like user data storage homework assignment and notification web based peer review grading etc The MOOC is intended for one semester with four labs each lab is associated with an instruction as well as several video lectures all the labs and video lectures covers a major subset of basic of electronic knowledge and functions of microcontrollers like digital T O analog I O LED pushbutton PWM timer etc All the videos of the MOOC are hosted on Youtube to alleviate the burden of our own server The server side system for our MOOC takes on the responsibility to build bridges among different functions of the MOOC and it also provide ways for users to interact with each other The system is built on PHP and Mysql the former is a popular server scripting language with a large number of developers using it and many good modules and frames that can speed up the process of server side development In our design PHP is used with WordPress a full fledged and well known content management frame based on PHP for implementing all the logic behind the service we provided with our MOOC the latter is one of the most widely used relational database management system which works perfectly with PHP with thousands of successful web applications based on this com
54. line if they want to get their scores After students submit their work on the upload page we will create a record in table Submission for him or her After the submission phase it is the assessment phase After TA click the button to assign the assessment we will create records in table Assessment Each user will have several records in Assessment table which decide whose work they need to review and how many assessment they need to accomplish According to the records in Assessment table 21 students can view their assessment tasks in assessment page Based on the rubrics stored in Criteria table students can review other peers solution and give scores and coments for each rubric those information will stored in the GradingPoint Table After the assessment phase it comes the grading phase If students accomplish all their assessment tasks system will calculate the grades for their submission and the grades for their assessment based on the records in Assessment Table and GradingPoint Table After calculation store their submission grades and assessment grades in the corresponding records in Submission table thus students can view their scores If students do not complete all their assessment tasks they cannot view their grades as a punishment If a student s solution is reviewed by less than two peers but he or she complete all the assessment tasks assigned to him or her they can only see their assessment grades since the
55. ments user can provide we did not change much from the coller theme for this part Page php is used to develop the basic templates of simple html page All our page is divided into two parts one is pages written in the folder page template where we use php to control the whole structure The other are pages that only contains the html elements we just use the default page template and some html css to design them for example our home page and syllabus 404 php is used to display error page when users try to access a link that not exist In our 404 php we design to tell the users this is not a valid page and lead them to the websites they might really want to access We also develop the page full width php and single php are used to display two different kinds of pages The first one is used to pages that not own sidebar and the second is pages with sidebar And the most important part we design is our style css All of our pages and other php 30 file use this style css file Because our website is a MOOC course website we design not to display too many gaudy features For these kind of websites simple and easy to use is often at first priority so we decide to use simple gray and green combination We first defined some basic features like how links looks like and how hl or h2 look like Then we use class and id to define definite demand of certain elements 31 3 Course Content Design 3 1 Lab Design 3 1 1 Design Go
56. mission table and only check the data from Assessment Table In such situation we cannot decide which assignment this assessment is belong to then we get more than four assessments for one student including all assessments he need to assess in four labs which is sixteen in this case Bug 2 When we test the submission work phase we need to save the report and code files under folder upload the limit of authority stop us to do such action Then we should set the limit of folder upload to 775 Bug 3 To enable use pretty look permalinks we should install the mod_rewrite module in apache server and also alter the AllowOverride from none to all and also change the permission of htaccess file in root folder to mod 775 so that WordPress will be able to change it Bug 4 When we migrate our system from localhost to server we found that although it works fine in localhost there are many bugs when it is running on server When modify the wp config php file make WP DEBUG false to WP DEBUG true And add one line ini_set display_ errors 1 after the above line So that any error logs will be displayed This is debug mod we should change it back after deploying system Bug 5 59 By using the DEBUG mod we find that it is because the version of PHP is a little old so that some syntax are not supported We modified our code to adapt to the PHP of server 60 5 Conclusion
57. ne courses and ECE 4760 is a lab based microcontroller design course in Cornell University which uses hardware and software techniques to teach students a variety of design skills culminating in a large design project In order to let massive users take lectures and do labs and then grade others works online we hook up 123d circuits io a free online platform for developing and debugging electronic projects to the content management and homework grading system made by ourselves The content management is realized with PHP WordPress and Mysql and the grading component is based on web based peer review grading method Our goal is to create a safe service with high scalability to let people around the world learn the basic knowledge of microcontroller and put theories of it into practice without buying microcontrollers and accessory parts and get feedbacks on their way of learning Report approved by Project Advisor Date Executive Summary The MOOC is intended for covering a major subset of the basic of designing with circuits and microcontrollers and let users or students to learn and carry out labs online in one semester To achieve the goal video lectures lab instructions and course policy are made to help users of the MOOC learn There are four labs in this course labl is for teaching users of the MOOC how to use the MOOC and the online simulation platform 123d circuits io as well as the knowledge about Arduino LEDs digital I O
58. nstruction Instruction Detail Detail Detail Detail Detail Start Time 2014 05 12 2014 05 12 2014 05 12 2014 05 12 End Time 2014 06 30 2014 06 30 2014 06 30 2014 06 30 If the grades has been calculated before those button will not work and give you the information like below This assignment s grades are already been calculated We check the view score part we tried different situation we discussed above to see if situations in design decision happens whether or not the student can see their score 53 After checking all the situations we may meet with in score part we came to the regrade part In this part we mainly check whether student is qualified to request regrade For those who are not qualified our system will give them corresponding hint In the test part we decided to test all the corner cases we have mentioned in the design decision Here are the situations we have tried We will simply say five student users as A B C D E We first test the situation that A and B do not assess C s work and C complete all four submissions he is assigned In this case A and B cannot see their submission grade because they didn t complete all four assessments and they cannot request regrade C can only see his assessment grade but cannot see the submission grade because only two people D and E assess his work He is qualified to request regrade and when he request system will find a TA to assess his wor
59. nt 10 BssignmentName char 255 descriptionPath text maxSubmitGrade int maxAssessGrade int numOfAssessments int timemodified datetime assesmentFacter float submissionStart datetime submissionEnd datetime assessmentStart datetime userlD int user type int us us er login text er pass text user nicename text user email text Ser registered datetimp disp author submission D int assignmentlD int userlD int gradeForSubmit int finalGrade int gradeForAssess int lay_name text reviewer TAregrade AssessmentlD int submissionlD int reviewerlD int GradingPoint submitGrade int submitted int gradingPointlD int assesmentiD int dimensionid int points int peerComment text assessmentEnd datetime regradeStart datetime regradeEnd datetime assessmentAssigned calculated int assessmentintroPath text regrader D int reportPath text codePath text videoLink text circuitLink text submitted int Criteria criterialD int assignmentlD int dimensionID id maxgrade int description text Entity Relationship Diagram of Database 2 4 2 Detail description of database Table User This table keeps the information of the user of our website Field Type Default Info userID bigint 20 auto numbered serial user type Text Define the type of the user contributor administrator subscribor user_login Text NULL the login account of the user
60. oints if two LEDs start blinking when timer countdowns to 0 A heavily commented listing of code will get you 10 points and a complete report also accounts for 15 points Lab4 The last lab assignment is to build a pointer using servo The servo is controlled by a self made keypad In lab4 students have to build 3 3 keypad using pushbuttons When key 1 is pushed the servo begins rotating until it points to the first LED and the first LED turns on When key 2 pushed servo turns to the second LED and lights it up Similar when you push key 3 4 5 6 Key 7 is used to reset the servo and LEDs When key 8 1s pressed the servo starts sweeping from 0 degree to 180 degree and as it passing a LED the LED will be lighted up When key 9 pressed the servo sweeps back from 180 degree to 0 degree This lab is designed to let users learn the principle of keypad and how to control servo in the Arduino To do this lab students need to combine what they 40 learned from lab1 3 and carefully deal with the timing issues Students are expected to know the principle of keypad and servo after this lab The keypad is basically made up of 9 pushbuttons and 6 wires Reading the value on each line in a proper way can detect which key has been pressed The library of 123d circuits io does not include the keypad so users have to build it by themselves But that actually is good way for users to fully understand the structure of keypad Servo motors are widely
61. ol the brightness of one LED In example users will see connection of potentiometer in virtual breadboard and the syntax when using ADC and PWM in Arduino After watching all those mini lectures and example students should be fully prepared to work on lab2 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D13 A0 Q Q Q Q Q Q Q Q Q Q Q s1 uj BN wal s tl iw uis to Sno R11 R1 R2 L2 R3 R4 R5 R6 R7 R8 R9 R10 Schematic of Lab2 Lab2 accounts for 20 percentage in final grade Total points for lab2 are 100 points Students can get 35 points if they accomplish one mode either controlling the brightness or controlling the lighting numbers They can get another 35 points if both two modes are accomplished and can be switched smoothly Same as the first lab a heavily commented listing of code will get you 10 points and a complete report also accounts for 20 points We provide those grading criteria in the instruction so the students can predict their grade when they submit their job Lab3 The third assignment is to build a countdown timer using a 7 segment The 7 segment is controlled by serial communication When opening the Serial Monitor and inputting a number between 0 and 9 in the command window the segment will display the number you input and then countdown When it countdowns to 0 two LEDs start blinking This lab aims to let students learn how segments work how to do with serial communication 38 and how to use m
62. or them to conveniently study this lab based course online The basic functions are as follows view the basic information and material of this course submit their work after they complete the labs help them easier assessing others work give them a fair grade The basic information and material of this course is displayed on the course websites where students can easily access The information includes the following the syllabus instruction of every lab the lectures student may need to learn before they start each lab As this is a lab based course and student have to some labs during the study to get experience of microcontroller However we may have massive users from everywhere around the world we want them pay low price or nothing to study this course We find a 123circuit website which can design the circuit on so that student do not need to buy any hardware for these labs After students did their work they can submit their work on our websites The work will contains report code a video link and a 123circuit website link All four things make us easy to assess their work A video is used to record some trivial things that student may cannot describe in words and need to show us something After their submission they are assigned four peers works to assess They can simply complete a grading form to assess other s work After assessment phase students get their grades The grades are depended on how well they d
63. ou are not allowed to request for regrading After C request for re grade TA1 s detail page Home Syllabus LabTableForTA Forum Guidance TA Detail Page Assign the assessment Caculate the grades Below is the regrading tasks assigned to you for assignment 1 Assessment1 C s view regrade score page 57 Home Syllabus LabTable Forum Guidance Your Score e Submission Grade From TA Assessment Grade Final Grade 61 18 00 79 You submission is assigned to a TA you can contact the TA by email TA1 gmail com MOOC Theme by ece4760 Welcome to Join us As we discussed above our system is in a strict order that users are not allowed to do things in the reverse order if this happens the system will give users the hint and inhibit these actions For example you cannot upload your file before you log in to the system you cannot assess others works before you submit your own work 4 3 The result of test We find some bugs during the test and finally correct them and make our website works well Here are some important bugs we have find Bugl In the assessment php we want to get data to display in the page using such command query wpdb gt prepare SELECT Assessment assessmentID Assessment submitted FROM Assessment Submission WHERE Assessment submissionID Submission submissionID AND Submission assignmentID d AND Assessment reviewerID d assignmentID userID 58 In the beginning we forget the Sub
64. ow of system sss 22 2 6 Theme Design aiarar c to Soi Err eee ere 29 3 Course Content Bic 24 iesise eaae chica lat uri anaa aaeain 32 EX Lab Design scoters aa a US 32 311 Design Goals iaia ertet iuit ap arap anadai ananira aaa ee eee ere 32 3 12 Desio N Proces Siimon a E A EEE 32 3 1 3 D sign Mord T es 35 3 2 Making NS eene ea oet nantur dom etit ione eeed 42 4 l est dnd Debug iaria aatia Sey een VEE since Det esee 44 AN Meth OG OR 44 ADV A Stati TOS ecstisicaiaia aoa a a a teed E manana aseiomaieas 44 4 1 2 Dynamic test asiain a ode plo ndi hee pa ipi de is 44 4 2 Details of test each stage ue eei teret tteSe tope aa ace toit 44 Z 3 Th result of USSU isis ei a fetta a toast Rl ULM fua S 58 S COBCIUSIOHS C eis aerae tot a Ue LED ct ste A eae EE 61 6 Referente UN RR 62 Appendix A User Mamdal sucede toad tuoi bud du endet 63 Appendix B PHP COC CS et eed ve db ee edie us c e a 64 Appendix C The SQL we use in the system esent tnnntnnntnnttnntnnttnntn 64 Abstract Master of Electrical Engineering Program Cornell University Design Project Report Project Title MOOC for microcontroller design course Author Mingming Dai Junhao Dong Yun Hao Yuanyuan Gong Yize Li Abstract The design project is to develop a strategy for MOOC lab delivery and implement it for a online course which is like a web version of ECE 4760 MOOC means massive open onli
65. s 10 5 H the grade for assessment has not been aggregated yet NULL the path of report file pdf stored in server NULL the path of code file zip stored in server NULL the link of youtube page which explain your work NULL the link of 123circuits page 0 the user did not submit complete work for submitted tinyint 4 the assignment 1 the user has submit the complete work for the assignment 19 Table Assessment This table keeps the information about the made assessment and automatically calculated grade for it TA can override it if student do not receive their grades when grading ends int 10 int 10 auto numbered serial The id of the assessed submission The id of the reviewer who created this assessment The aggregated grade for submission suggested number by the reviewer The grade is computed from the t NULL eee 10 5 values assigned to the assessment dimensions If NULL then it has not been aggregated yet eee iya O this assessment is not completed 1 this assessment is completed Table GradingPoint This table contains the information of how the reviewers filled up the grading forms given submission grades and comments Description gradingPointID int 10 auto numbered serial Part of which tth int 10 grade is of Table Criteria Given grade in the referenced assessment dimension Reviewer s comment to the grade Foreign key References dimensionID int 10 dim
66. s who interested in electronics with the basic electronic knowledge and functions of microcontroller By doing the labs students will learn the design procedure of a microcontroller project After taking this class students are expected to be able to design their own projects with Arduino fulfilling their interesting and fancy ideas Lecturer Yuanyuan Gong Contact yg325 cornell edu Distinguished Lecturer Prof Bruce Land is our guest lecturer for few exciting sessions Course Outline Lab1 Chasing LEDs with Button Control a a 0 0 00 008v99MX0c meum o n Forum Page Forum Home Forums Forum This category contains 5 topics and 2 replies and was last updated by yunhao 5 hours 58 minutes ago Forum Topics Posts Freshness Lab1 1 1 6hours 1 minute ago yunhao Lab2 1 1 6 hours ago yunhao Lab3 1 3 5 hours 59 minutes ago yunhao Lab4 1 1 5 hours 59 minutes ago yunhao Suggestions 1 1 5 hours 58 minutes ago yunhao Guidance Page 46 Guidance Dear visitor and student this is a user manual to our website As a student you should first have a look at Syllabus to get an overall understanding of this course After having a basic view of this course if you decide to take this course you could go to the lab table page In the lab table page you can click the instruction link and see the detailed description of the lab corresponding materials resources and video lectures from Professor Bruce R Land Yuanyuan
67. system could not calculate their submission grades based on the information of two peer review records This lead to the re grading phase students who only get their assessment grades can request for re grading And their request will be assigned to a TA by random and after TA review this student s work system will calculated the grades and store it to corresponding record in Submission table thus the student can view his or her complete score 2 5 2 The detail description of the data flow of system 2 5 2 1 Description This part mainly describe the detail of the data flow of our system based on each phase How the system work page to page What information to get from the database during each stages How the database will change during different stages by inserting an updating records 22 2 5 2 1 Data flow when registration When students registered to our website a record that contains his or her information will inserted to table User and allow this user to use his or her login name and password to access our website again The user ID in our database is crucial since it is used to identify the user and served as foreign key in other table Students can view the instruction and go to the assignment page of each lab based on the lab table page 2 5 2 3 Data flow in submission phase At the beginning of the submission phase students can use the lab table in our website to get access to the assignment page of each lab If the time
68. t assessment is the one closest to the mean For each assessment the distance from the mean is calculated similarly as the variance Standard deviations very close to zero are 13 too sensitive to a small change of data values Therefore data having standard deviation lt 0 05 are considered equal variance 0 for each assessment dimension if stdev gt 0 05 then variance mean grade wight stdev 2 If there are less than three assessments for this assignment they all are considered best The best assessment gets grading grade 100 All other assessments are compared against the best one If there are more best assessments the one closest is used as a reference The difference distance from the best assessment is calculated as sum of weighted square differences sumdiffs 0 sumweights 0l for each assessment dimension sumdiffs bestgrade peergrade dimensionweight maxpossiblescore 2 sumweights dimensionweight In this strategy the weight of every dimension is calculated as w max minj And we use the following formula to compute the gradinggrade which means how well student assess others work gradinggrade 1 f sumdiffs sumweights 100 96 In our case we choose f as 2 5 we can change the value of f to change the strategy of our 14 grading system The possible values are very strict 5 00 strict 3 00 fair 2 50 lax

MOOC for Microcontroller Design Course - ECE

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