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1. q l A l gji EE EE ll A A al Al desc short description of the class We re assuming that this is an online class and no location or timing needed IV Exams Table 26 iTeach Field Type Collation Attributes Null Default Extra Action E id int 255 No auto_increment E Xx B m classiD int 255 No EXA A m name varchar 500 latind_swedish_ci No f E m start date No E A Ee m end date No E FA E FJ grade varchar 500 latind_swedish_ci No El A z E F desc varchar 500 latind_swedish_ci No f r B Figure 35 Exams Table id is the primary key cClassID is a foreign key of id located in the classes table name name of exam start when is the exam going to be available end when the exam is due grade maximum grade for the exam desc any instructions of information related to the exam V Questions Table Field Type Collation Attributes Mull Default Extra m H int 255 No auto_increment p examiD int 255 No or p question text utfe_general_ci No T answer text utfe_general_ci Ho F Figure 36 Questions Table id is the primary key examlID is a foreign key of id located in the exams table question the content of the question answer the right answer Not exposed to students IV Answers Table Ze iTeach Field Type Collation Attributes Null Default Extra Action a id int 255 No auto_increment PE m m studentiD int 2
2. located next to the designated assignment See figure 18 Clicking on the grade assignment leads to the loading of a new view that allows the instructor to assign a numeric grade to each submission See figure 21 The new view lists the student name student submission and a field in which the instructor assign the grade The view also shows the assignment instructions on the left side of the screen as well as the maximum grade that can be earned Furthermore clicking on the delete button leads in the assignments list will delete the designated assignments and all submission related to it 16 iTeach Tuesday December 21 2010 7 12 15 P M User Roy Smith paa gt Rank Instructor Sign Classes Class CS3810 List out Title Starts 01 B January B 2010 B Ends 01 B January B 2010 B Grade Information Notes Assignments Exams Communicate Grades Figure 20 The add a new assignment view Tuesday December 21 2010 7 12 47 P M User Roy Smith paa Pa Rank Instructor Classes Sign Class CS3810 List out Assignment s Instructions Student Kim Ho sdfgsdghguffjggdftretwedrfsfdfgdfgdffafgesfdfgs errwrtwertwerfewrfewrtrewfrewfrew egdfedfedfedfe lewrmf ewrflm mrewf rewf rmf Student Anna Smith Possible Grade 50 llirmirmglmrigmirmg Information Notes Assignments Exams Communicate Grades Figure 21 Grading a specific assignment From the assignments view a
3. 2 channel audio output interface a 10 100M Ethernet interface and an SD MMC interface that supports 3 3V and 1 8V logic voltage Furthermore the manufacturer provided board support packages along with source code of various Windows CE components allow us to customize our special user interface User interaction with iTeach is strictly through the LCD touch screen panel A touch screen driver which handles touch recognition in our application is included in our custom Windows CE image Figure 46 displays Devkit8000 board and its supported peripheral devices and interfaces 32 iTeach eT eine 10 tne USB USB 0TG OST Device 1SOH esnt OI IDVI D monitor USB HUB Figure 46 Devkit8000 1 2 Dual Input Power Supply iTeach accepts two types of power sources DC power and battery power When an AC DC adapter is plugged in this source powers up the main board and the LCD touch screen At the same time it charges the Lithium Ion battery which remains temporarily inactive If an adapter is not available the single 3 7 Volt Li Ion battery will act as the main power source The output end of the switching circuit 1s connected to a DC to DC booster from which the board receives power This booster provides the board a current of 1A at 5 Volts which is converted from the 3 7 Volts gained from the battery Figure 47 below shows the schematic of our power supply which consists of two main components Maxim MAX1874 and Tex
4. be available end when is the assignment is due grade maximum grade for this assignment desc short description of the assignment II Submission Table when student submit his her assignment 23 iTeach Field Type Collation Attributes Hull Default Extra Action a id int 255 No auto_increment E B fol E assignmentiD int 255 Ho El F A Ful m studentiD int 255 No El Ful m name varchar 500 latind_swedish_ci No El 7 A Ful m date date No H f A Ol E content text latind_swedish_ci Ho E 2 A E Fu attachment varchar 500 latind_swedish_ci Ho El f A Ful m comment varchar 500 latind_swedish_ci Ho El Ful F grade int 255 No E 22 E fol E Figure 33 Submission Table id is the primary key assignmentID is a foreign key of id located in the assignments table studentID is a foreign key of id located in the students table date date of submission content students submission attachment URL s to the file s on server that student upload comment any feedback from the instructor grade grade for this submission I Classes Table Field Type Collation Attributes Null Default Extra Action m id int 255 No auto_increment E xo E fol E y instructoriD int 255 No fe 2 zo E fu m name varchar 500 latind_swedish_ci No fe E fu m dese text latind_swedish_ci No fe 2 2 5 fu Figure 34 Classes Table 1d is the primary key instructorID is a foreign key of id located in the users table name name of class
5. can never see the personal information of user B As Figure 2 shows the dashboard contains a list of classes joined or taught by the current user as well as other options Instructors are given the option to add new classes or allow students to join their classes while Students are only given the option to lookup classes and join them Student VIERA options ii classes A _ Teacher View options Figure 2 An overview of the system pages iTeach The dashboard of the instructor is designed to list classes that they are currently being taught classes that are inactive or under construction and classes that have been taught during previous semesters Likewise the dashboard of the student is designed to give students the ability to access their current classes see but not access classes that awaiting to be given access to or access classes from previous semesters Once the user requests to view a certain class a new view will be shown The new view is called the class view Each class has its own unique information that gets shown For instance the view of a history class shows only the assignments exams grades emails and notes that are related to this class The class view has sub views that organize the content of each class These sub views have different purposes depending on the rank of the user The assignments view for example keeps track of all assignments related to this class Instructors
6. the Assignment Once you are logged in perform the following steps 1 Click on Assignments 2 Click on Modify next to the assignment you want to modify How to modify the Exam Once you are logged in perform the following steps 1 Click on Exams 2 Click on Modify next to the exam you want to modify How to modify the class syllabus Once you are logged in do the following steps 1 Click on view Class 2 Click on View on the right side of the specific class 3 The front page is the syllabus so just modify what you want 4 Click on Save Changes If you are on the other side of 1Teach click on Information and then follow the steps from 3 44 Appendix C Source Code A package of the source code of 1Teach is available on the following link http www iteachs com source zip FHF PHP FHF FHF PHP iTeach PHF class php emaill php email2 ohp email3 php email4 ohp email5 php PHP Se uma vote PHP AS PHP nelp php images includes index php j5 login php 24 items 4 items 17 items PHP PHP FHF PHP logout php register php show php view php class php Loads the class view display the six button on the footer and shows the class information help php Display the help information at the main view A collection of all images that are used A collection of PHP classes that initiate the session and connect to the database Loads the main view A collection of JavaScript functions that validates each form 1s used a
7. the class name The two buttons offered by this view allow the user to either sign out from the system or go back to the list of classes the dashboard A student that wants to go from the current CS3810 view to the Math 1100 view will have to click on the black button on top which loads the dashboard illustrated in figures 9 and 10 Figure 14 also shows how the class view redefines the footer Instead of showing instructions the footer now shows a series of buttons Each button loads a sub view in the grey block located on the middle of the screen These buttons are the same for students and instructors By default the class view loads a view that is called the information view It is the same view that the button information in the footer loads Tuesday December 21 2010 6 26 28 P M User Anna Smith Pra pun Rank Student Classes Sign Class CS3810 List out Term Fall 2010 Class Times Section 1 MWF 09 40 10 30 AM in WEB 1248 Section 2 MWF 10 45 11 35 AM in WEB 1248 Information Assignments Communicate Grades Figure 14 Class View Student s View The class view lists 6 different button in the footer A Information This button loads the class information While the enrolled student is only able to read this information the instructor of the class can read and modify this information As Figure 15 shows an instructor has the ability to modify at any given time the information that is shown in the info
8. to the file s on server that sender upload XII Permission Field Type Collation Attributes Null Default Extra Action E classID int 255 No il i Ss E x fell el NS R a MTF O E studentlD inti255 Ho Figure 42 Permissions Table ClassID is a foreign key of id located in the classes table studentID is a foreign key of id located in the users table 4 Web Based Classes Manager In order to upload class notes Instructors have to use the web based management system that can be accessed through the following link http www iteachs com An instructor uses his or her personal computer to upload Slides and PDF files While file uploading is restricted to instructors only students can still access the web based system to update their login information and reset their passwords Once an instructor is logged in a list of his or her classes will be shown The instructor then chooses the class note file that will be uploaded from his or her computer assigns a name to this new material and selects the proper class from the menu By clicking on the upload button the web based system saves the file in a secure location in the server and injects a reference to it in the database The file becomes immediately available and ready to be viewed Meanwhile a student may navigate to this particular class and click on the notes button Figure17 to see all uploaded materials The uploaded class note file should appear on top of the
9. use the assignments view to create new assignments while students use this view to submit their assignments Similarly students use the grade view to see their grades while instructors use their view to assign grades to each assignment or assessment Some sub views are designed to have the same functionality for both types of users For instance both an instructor and student can use the email view to send messages to other users enrolled in the same class The email view is a vital tool for users to communicate with each other Student Search view Classes List of List of inactive Old Classes Classes Class View Figure 3 Dashboard iTeach 2 User Interface The user interface was programmed in PHP which is a server side language that can connect to databases PHP uses the information provided by the user to collect data from the database make certain modifications to it and then display it on the screen The interface is enhanced with HTML components CSS and JavaScript HTML components are used to draw the tables and set the text fields while CSS is used to colorize the views and display images JavaScript on the other hand is used to verify the user inputs handle error messages and show alert boxes Tuesday December 21 2010 5 39 42 P M Please login to view your classes Figure 4 Main View The main view gives the user the opportunity to login using pre defined username and password register
10. 1 2010 1 23 25 A M User Anna Smith Join View Sign Rank Student Class Class out Quantitative Analysis Introduction to World Religions Business and Professional Ethics Family Economic Issues Intermed Macroecon lt AAA gt gt Welcome to your dashbord Figure 9 Student Dashboard Tuesday December 21 2010 1 23 09 A M User Roy Smith Add Add View Sign Rank Instructor Class Student Class engineering physics computer systems elec com Intermed Macroecon Family Economic Issues P NEE ini Welcome to your dashbord Figure10 Instructor Dashboard The dashboard view includes sets of buttons as well as a block of information that are located underneath the header While the block is meant to show the information that identifies the current user the user full name and the rank the buttons are designed to simplify the process of navigating between views As figures 9 and 10 illustrate instructors are shown options buttons that are slightly different than the buttons that are shown for students Depending on the rank of the user the dashboard can provide the following options A View Class This is the default view that the dashboard loads once the user is logged in Figures 9 and 10 This view can be reached by clicking on the green button on the dashboard A list of classes is also shown in this view This list represents the classes that the current user has already joined First time users will have an emp
11. 2 Maxim MAX1874 specifications http www maxim ic com quick_view2 cfm qv_pk 4005 3 Texas Instruments PTNO4050C specifications http focus ti com docs prod folders print ptn04050c html 4 Maxim MAX608 specifications http www maxim ic com quick_view2 cfm qv_pk 1252 t al 5 Tenergy 3 7V Lithium Ion battery specifications http www batteryjunction com 2600pcb 18650 html 40 iTeach Appendix A Bill of Materials Devkit8000 including 7 LCD touch screen and Wifi Embest Info amp Tech 343 343 module 4 3 oe inductors AE com hola uF OSCON capacitors e pp 2 2 uF and 0 1 uF ceramic A Stockroom capacitors University of Utah Ion Batteries SSL Certificate GoDaddy com MA _ 179 88 Monthly Leased Dedicated GoDaddy com 14 99 co Server lcd 88 Vendors Websites Texas Instruments www ti com Embest www embedinfo com English index asp Maxim www maxim ic com Digikey www digikey com 41 iTeach Appendix B User Manual If you are a student first you need to register in order to use 1Teach If you are a teacher your account is already created in the database How to register as a student To create an account follow these steps 1 Go to www iteachs com 2 Click Software Demo 3 Click on Register 4 Enter the following information and then click on Next 1 A username that has a length of between 4 and 16 characters 2 A password that has a length of between 4 and 1
12. 55 No y E HA ET m examiD int 255 No P fF T m answer text utf8_ general ci Ho A zo fe tul fe it m grade int 255 No ce OF A A T Figure 37 Answers Table id is the primary key studentID is a foreign key of 1d located in the users table examID is a foreign key of id located in the exams table answer student s answer grade for this answer IIV Notes Table class notes posted by the instructor Field Type Collation Attributes Null Default Extra Action E id int 255 Ho auto_increment PA T 7 classiD int 255 No fe zo E T 7 name varchar 500 utfS_general_ci No El 4 A T 7 content text utfS_general_ci Ho E 2 X E Eu T Figure 38 Notes Table id is the primary key classID is a foreign key of id located in the classes table name name of note content textual content IIV Users Table includes instructors and students Field Type Collation Attributes Null Default Extra Action a i int 255 No auto_increment E X m uid varchar 500 latind_ swedish_ci No fe A username vVarchar 500 latind_swedish_ci No fe A E password varchar 500 latind_swedish_ci No Fa A m fullname varchar 500 latind_swedish_ci No EE f r Fu m rank int 2 No O f X E Figure 39 Users Table 28 iTeach id is the primary key uid campus id uID username username needed to login password password needed to login fullname the name that will be displayed in the form First name initia
13. 6 characters 3 The ID number that your school gave you 4 Your Social Security number How to log in If you already have an account with i1Teach take the following steps 1 Go to www iteachs com 2 Click Software Demo 3 Click on Login 4 Enter your username and password 5 Click on Login How to add a class In order to add a class you want to join the class and you need to get approved by the teacher who is teaching that class so perform the following steps 1 Login 2 Once you are logged in click on Join Class 3 Click JOIN for every classes you would like from the list that is available on the page How to view your classes In order for you to see a class two things need to happen The first thing is that you need to join the class and the second is that once you join the class the teacher needs to approve you If the previous conditions are met then perform the followings steps to view your classes 1 Login 2 Once you are logged in click on View How to see your grades Once you can see the content of the class click on Grades at the bottom of the page to see your grade How to see your assignments Once you can view the content of the class click on Assignments at the bottom of the page to see the list of assignments you have How to do your assignment 42 iTeach Once you can see your assignment click on Do Assignment at the right side of the specific homework How to know if homework is subm
14. DC DC Step up Converter 3 One advantage of this IC is that it can provide high efficiency voltage conversion for loads of up to 12W In contrast the initial design was based on the MAXIM608 and was only meant for giving out a maximum of 500mA at 5V which is not sufficient for the Devkit8000 and 7 touch screen In our testing with a 3 7V 2400mAh Lithium Ion battery this fully charged battery cell can power up the Devkit8000 for approximately one hour under normal operating conditions Also worth mentioning is the ability of the dual input power supply system to switch seamlessly between AC and Li ion battery power source The moment the external power is unplugged from the board the system keeps running due to the onboard battery without any interruption and users will not even notice any differences By measuring the voltage at the load we were able to verify a constant 5V DC voltage with just minimal amount of ripple as illustrated in the captured waveform in figure 52 shes sae JMB OO EAL RUN Dates isle baie ete ee nein tiene cee Baers bewieier A A eee ae A eae A A eee See ean A VaevgcAli 4 955 Y Figure 52 Load voltage waveform 36 iTeach Lessons Learned This project has provided a wonderful plethora of lessons for us thus far These lessons have definitely made us better engineers and better team players We had to obtain more knowledge and practice new techniques in order to accomplish our achievements The follow
15. IT each www iteachs com Eyad Fallatah eyad fallatah Outah edu Long Nguyen nguyen long utah edu Navid Sobhani navidsobhani yahoo com Computer Engineering Senior Project Fall 2010 Advisor Professor Al Davis School of Computer Engineering University of Utah iTeach Table of Contents Tablero COMO arial 2 PANTO UG OIE sorrera a E AEE A cae manent es 3 A E AE ae nia deena ee anand aaiedents 5 o PP EEA E ay sve ead O A 2 User Merconorte ote 7 Ona ann cite Vine Data 2255202 ct not ntineseaa domed eek comaieaicasaeareaneass 21 Web Based Classes VS ells orrae E E noon O awe 30 Plat OW ALC PO PO II A Ea OET 32 DEVK OOD asaina OU a N A 32 Dial Mpu Power Supply sai ts 33 EE A O EIEE AA 37 COn USON taa orto rd 38 PNG IEA LEO Cilie OU RECON A aaa ai 39 BIDHO AOI ssc ce he cata ght aan care a pao en gig estas oe ee enti 40 Appendix A BULof MaternalS sardina 4 Appendix B User Manta learn lod 42 APPendix E SOUTO C Odee nee acon Vena tee ee eden Nass 45 iTeach Introduction As the world continues to move forward we are constantly attempting to keep pace with all the latest technology advancements and essential job skills for our careers We are also constrained with full time employment and family commitments while aiming to maintain some semblance of a social life Those with busy schedules might find it quite challenging to succeed in a college setting To meet the needs of those who desire to continue their
16. and software development is important but is often neglected During first several months our solution of developing iTeach was divided into hardware and software part and each member was responsible for only one Therefore weekly meetings had to be arranged in order to keep all team members updated on different aspects of our project During each meeting all members reported the progress that they made in one week and how their contribution affected the overall progress 37 iTeach Conclusion The primary goal of this document is to describe how a team of three hard working students was able to create a portable interactive device that simplifies the process of distance learning The outcome of nearly one year of engineering is an astonishing touch screen device that puts learning materials at the fingertips of those who are involved in distance education This project is a combination of brilliant software developing and robust hardware engineering iTeach is comprised of a 7 inch multi touch screen a single board computer and a dual input power supply The device runs on Windows CE and is managed by a custom application that makes use of remote databases for storing and retrieving information iTeach solves a problem that we constantly face It provides the answer to the professional and personal commitments of those who are constantly attempting to have full time employment learn new concepts and maintain some semblance of a social life Th
17. as Instruments TI PrNO4050C 33 iTeach PTNO4050C 4 3 uH il 4 3 uH Vout 5V D Vi Vo GND 3 2 2 uF 0 1 uF 100 100 0 1 uF 2 2 uF y AE _ 22 uF Li ion battery 1kQ 5 4 7 uF MAX1874 Figure 47 Dual input power supply A Dual Input Power Switching Circuit The MAX1874 is available pre mounted on a Maxim evaluation board pictured in figure 48 Figure 49 illustrates the inputs coming from either an AC DC adapter or an USB port on a computer while the outputs are connected to the system load 1 e DevKit8000 and the Lithium Ion battery The Maxim MAX1874 IC monitors when there is an external power supply available through the DCOK and UOK pins When a power input is present MOSFETs Q1 and Q2 as well as diodes Dl and D2 will bypass the battery and connect the power supply directly to the load Meanwhile the Power on PON pin on MAX1874 IC shuts off Q3 if an external power is active hence effectively disconnecting the battery from the load This design allows smooth switching from the onboard battery to external power while the device is operating W MAXIM IC COM ATION KIT cw PA oa S o o a o gt i m i o i lt gt u lt gt lt A a N 34 iTeach pi DC INPUT MBROBQOL pa UP TO 6 5 lo PROTECTED MBROS20L pa TO 18V DC UT MAX1874 PON sae IT 750mA hr to 24 hr Liteon Cell ER ER gt THI HTG e
18. conceptual schema or semantic data model of our system The first stage of our software design required this model It describes the type of information that is to be stored in the database The data modeling technique was used to describe any ontology for a certain area of interest The conceptual data model was later mapped to a logical data model Figure 31 in order to design the actual database An entity may be defined as a thing which is recognized as being capable of an independent existence and which can be uniquely identified An entity is an abstraction from the complexities of some domain An example of an entity in our design is the user In the Model each entity is represented by a square A relationship captures how two or more entities are related to one another Relationships can be thought of as verbs linking two or more nouns For instance an owns relationship between a user and a class Relationships in the Model are represented by rhombuses While a single rhombus means a weak relationship double rhombuses mean a strong relationship Circles are used to represent attributes Each entity has to have at least one attribute While a double line indicates a participation constraint an arrow from entity set to relationship set indicates a key constraint Each entity in the entity set is involved in exactly one relationship and an underlined name of an attribute indicates that it is a key Two different entities or relationships with t
19. eate a class Once you are logged in perform the following steps 1 Click on Add Class 2 Insert Class Abbreviation Class Name and click on Next How to delete a class Click on Delete on the right side of the name of the class you would like to delete How to view your classes Once you are logged in the first thing you will see is the list of classes you are teaching so just click on View If you are under another section of 1Teach just click on View Class How to accept students from your classes 1 Click on Add Student 2 Click on Accept on the right of the student you want to approve How to reject students into your classes 1 Click on Add Student 2 Click on reject on the right of the student you want to reject 43 iTeach How to send an email The process is exactly the same as how students send emails to each other How to make an exam Once you are logged in perform the following steps 1 Click on Exams 2 Click on ADD A NEW EXAM 3 Insert your exam title start and end date 4 Click on ADD How to give a grade Once you are logged in perform the following steps 1 Click on Exams 2 Click on Grade on the right side of exam 3 Insert Grade next to each student name 4 Click on SAVE ALL GRADES How to create a new Assignment Once you are logged in perform the following steps 1 Click on Assignments 2 Click on ADD A NEW ASSIGNMENT 3 Insert instruction title start and end time 4 Click on ADD How to modify
20. ents Communicate Grades Figure 25 Communication View 19 iTeach Tuesday December 21 2010 9 09 07 P M User Anna Smith Rank Student Class ECON 4020 a gt a ln Classes sign List out o Back To Emails List Replay Delete This Email Sender kim Ho Date 08 Dec 2010 Subject hi from Kim Ho hi Information Assignments Exams Figure 26 Reading an email Communicate Grades Tuesday December 21 2010 8 14 59 P M User Roy Smith Rank Instructor Classes sign Class ECON 4020 List out Pe A EA a Subject Information Notes Assignments Exams Communicate Figure 27 A view to send an email F Grades Students can click on the grades button to view their own grades The view shows the maximum grade and the earned grade of each assignment Figure 29 Instructors on the other hand can see the overall performance of all students once they click on the grades button Figure 28 20 iTeach Tuesday December 21 2010 8 16 57 P M e User Roy Smith Rank Instructor Class ECON 4020 sign out _examl Total Grade hwl Anna Sito s n Information Notes Assignments Communicate Grades Figure 28 An instructor view of the grades Tuesday December 21 2010 8 17 31 P M User Anna Smith Amm Rank Student sign Class ECON 4020 Information Notes Assignments Communicate Grades Figure 29 A student view of the grades 3 St
21. for a new account and request assistance with login problems Once the user clicks on the designated option the JavaScript code updates the PHP file and loads the next view While some views such as Help shown in figure 6 are only informative views like Login shown in figure 5 are expected to collect information from the user inquire the database and display new information on the screen iTeach Tuesday December 21 2010 0 37 43 A M Please login to view your classes Figure 5 Login View Tuesday December 21 2010 0 37 29 A M Help Information In order to access your classes you have to have an account Please follow these steps to setup your account e Go to the registration page Enter your desired username and password Enter your ID number Enter your social security number Click on the OK button and you will be taken to the verification page Confirm your identity by reviewing the displayed information Please login to view your classes Figure 6 Help View The registration view collects information from the user and passes it to the PHP files In order to register a user must supply a desired username a desired password and his her identification number The user is expected to know his or her Identification number in advance which is used to determine his her rank Student or Instructor If verified the username and password are linked to the given identification number and the user will be automatically
22. for new accounts or log in using their existing accounts Personal information such as school identification number is needed in order to sign up for an account In an effort to maintain rules the system divides the users into 3 iTeach students and instructors The system compares the information provided by each user during the registration process against the information stored in the database in order to verify the identity and authority of the user Once authorized users will have access to their classes exams assignments class notes grades and announcements Users ranked as students are given the ability to search for classes join classes communicate with classmates and modify their personal information On the other hand users ranked as instructors are given the ability to add new classes view pre built classes grade assignments compose announcements and upload materials The usage of an interactive learning machine such as iTeach does not simplify everyday life task but also boosts the satisfaction and performance of those who are involved in any educational experience The constituents that iTeach serves include Pre K 12 education higher education home schooling continuing education and corporate training Simply 1Teach was designed to redefine the ordinary classroom iTeach Software iTeach is powered by Microsoft Windows CE which provides common services for efficient execution of the management application cal
23. his attribute always have different values for this attribute Figure 31 shows the process of producing a detailed data model of a database This logical data model contains all the needed logical and physical design choices and physical storage parameters needed to generate a design in a Data Definition Language which was used to create the actual database Each row in the model represents an actual table in the database Each row within any table has a unique id This unique id is called a key PHP uses the keys to lookup the designated record 22 iTeach Aid i assignments notes oes submission studentID Figure 30 Entity Relationship Model Consider the following example in order to better understand how the Entity Relationship Model and logical diagram help while designing a system that relies heavily on the usage of databases When user A signs up for a new account the information gets stored in the users table First row in figure 31 The first cell of the row holds a unique id that is generated by the database 1 e 3984 the second cell holds the identification id that was provided during the registration process the third cell holds the chosen username the fourth cell holds the chosen password the fifth cell holds the student full name and the sixth cell holds the user rank student or instructor If user A 1s ranked as an instructor and decides to add a new class the information of the new clas
24. ing are among important lessons that we learned while working on the 1Teach project A Software Engineering While developing a sophisticated system that consists of nearly 6 000 lines of code we learned that there is no or negligible participation of software engineering in web based systems engineering No or very inadequate trade off studies are meant to reduce the risk of high risk and in our case the high risk of software requirements Moreover we learned that there is no modeling and simulation of the system architecture to verify that the architecture will support system requirements for security performance safety reliability and fault tolerance Perhaps the most valuable lesson that we learned while working on the software side of this project is that there is no systematic and rigorous approach to making requirements consistent and that the evolutionary design of system architecture greatly increases the risk of excessive rework B Risk Management While developing our dual input power supply we had the chance to learn that we needed an effective risk management plan The fact that we had limited experience developing a custom power supply forced us to seek for information from all possible places Eventually we were able to come up with a solution that perfectly satisfied our requirements C Planning amp Tracking This project gave us the opportunity to learn that the visibility of cost and schedule status of the hardware
25. itted or not The assignments that are submitted have a checkmark at their left side They also have the Do Assignment button next to them How to email other people 1 Click on Communicate 2 Click on Send New Email 3 Select the receiver and write a subject 4 Once you have written the content of your email just click Send How to see the list of exams you have taken or need to take To see the list click on Exams How to take the exam Once you can see the list of exams you need to take just click on Take Exam at the right side of the exam you want to take How to know if you have taken the exam If you have taken the test there will be a checkmark to the left of the exam but if you have not there will be an X The Take Exam button will also not be available on the screen How to see class notes and lectures Once you can see the content of the class just click on Notes and you can view the list of the notes that is available for you To see them just click on Show How to see the class syllabus Once you are logged in click on View for the class you want to see and you will be forwarded to your class Its first page shows the class syllabus But if you are under another section of the class page click on Information and you will be forwarded to the syllabus The following information shows exactly how teachers can use i1Teach How to log in The login process is exactly the same as the student s login How to cr
26. l last name rank is an integer between O and 1 0 student 1 instructor By default the value will be O for security reasons X Weblink Links to other websites that instructors provide to student pai ba eag pu pen XI E o a E E Field Type Collation Attributes Null Default Extra id int 255 No auto_increment E X classID varchar 255 latind_swedish_ci No PP E name varchar 5000 latini_swedish_ci No EE PP A desc varchar 5000 latini_swedish_ci No El A link varchar 5000 latind_swedish_ci No FA Figure 40 WebLink Table id is the primary key ClassID is a foreign key of id located in the classes table name name of link desc description of the link link the actual URL to the link Email Table Field Type Collation Attributes Null Default Extra Action id int 255 Mo auto_increment PE T from int 255 No HE ka Ful T to int 255 No E Y A An iT date date No PA T subject varchar 500 utf8_general_ci No fe A Ful T content text utfe_general_ci No EE OF Xul 4 Er attachment varchar 500 utf8_general_ci No El A ro FA iT Figure 41 Email Table id is the primary key from is a foreign key of id located in the users table sender s ID to is a foreign key of id located in the users table receiver s ID date the sending date subject the title of the email 29 iTeach content textual content of the email attachment URL s
27. le on the fly from PDF or PPT to JPG and show the result of the conversion as an image 1Teach divides the content of each file into chunks and loads each chunk separately Such technique allows the user to read the content of the file while the file is still being loaded Wednesday December 22 2010 3 35 02 P M User Roy Smith PA paa Rank Instructor Clossea Sign Class CS4400 List out Information Notes Assignments Exams Communicate Grades Figure 16 The Notes View 14 iTeach Wednesday December 22 2010 3 35 05 P M User Roy Smith a yam Rank Instructor Classes Sign Class CS4400 List out CS 4400 Computer Systems Administrative Details and Syllabus Fall 2010 Course Information Description The objective of this course is to help students bridge the gap between high level programming and actual computer systems processors the memory hierarchy operating systems compilers linkers assemblers networks and more En i l Information Notes Assignments Exams Communicate Figure 17 Displaying a class note C Assignments The assignments button leads to the loading of a new sub view called the assignments view The new sub view allows students to submit their assignments and also allows instructors to manage their assignments By clicking on the assignments button instructors are shown an exam view that looks like the view shown in figure 18 On the other hand if a student clicks on the a
28. learning distance education provides the answers to their professional and personal commitments Computer technologies are used to deliver education to students who are not physically present in a traditional classroom In an effort to create an even better educational experience we combined the concept of mobility with the existing concept of distance education The outcome is a mobile device called i1Teach that can be carried everywhere and used from anywhere to access learning materials It can be used while sitting on a sofa lying on the bed or waiting for a bus In fact 1Teach is equipped with a rechargeable battery that can last up to two hours as well as with networking technologies such as Ethernet and WiFi in order to stay connected to the Internet Please login to view your classes canis pea y Teeme ee A y a _ rs Tur o e a Figure 1 1Teach Specifically designed to serve members of all types of educational institutions 1Teach is a portable interactive learning device that simplifies the process of learning remotely The device is controlled by a multi touch display powered by Windows CE and managed by a custom application The user friendly interface of 1Teach displays class information and options to users with respect to their rules and authority After turning the switch 1Teach will attempt to connect to a pre defined server that has all the classes information Users are expected to either sign up
29. led 1Teach Manager Upon loading Windows launches the management application browser that was written in C The application takes over the screen and disables any attempts to shut it down In parallel with the previous step the application disallows the launch of other applications as well as any attempts to minimize the window These limitations are meant to restrict the usage of 1Teach from non educational purposes While blocking attempts to run other applications iTeach Manager attempts to establish a connection to a dedicated server through a secured protocol HTTPS Upon connecting the application tries to access the landing page main view through a common domain https server iteachs com If attempts to connect to the server failed the application displays an error message and keeps waiting for a connection socket to become available 1 Overview The main view index is meant to authenticate users using unique pairs of username and password It gives users the option to either login using pre defined username and password or signup for a new account Once logged in users are directed to a new view with respect to their rank The new view is called a dashboard Users ranked as instructors are shown the instructor dashboard instructor view and users ranked as students are shown the student dashboard student view The dashboard contains unique information to each user For instance user A 1s only shown his or her own information and
30. list The student can read its content by clicking on the view button that is associated with this class note Ileach ae T s Clas ac anaqenent C2 ysTe i Figure 43 30 iTeach 1Teach Classes Manaqenert Susten Use the following form to upload class notes Please keep Update My Account in mind that this system does not except file types other Upload Class Materials than PDF O System Announcment _ m Select Class Read About The System C53810 re Note Name Sign Out Choose a file to upload Choose File no file selected Copyrights 2010 All rights reserved Figure 44 31 iTeach Hardware In this section we describe both Devkit8000 and a dual input power supply that make up the core of i1Teach A high level view of iTeach is illustrated in figure 45 DevKit8000 Power supply LCD Touch screen Figure 45 System Overview 1 Devkit8000 iTeach is built around DevKit8000 a single board computer running Microsoft Windows CE 6 0 The main reason that we chose DevKit8000 as our platform is its capability of running Windows Embedded CE 6 0 in addition to having built in support for Ethernet LCD touch screen and audio output It has a TI OMAP3530 microprocessor with 600MHz ARM Cortex A8 RISC Core and 412 MHz TMS320C64x DSP Core bundled with 256MB DDR SDRAM and 256MB NAND Flash 1 The kit comes with a 7 inch touch screen that supports resolution up to 2048 2048 a
31. logged in Otherwise an error message will be shown iTeach Tuesday December 21 2010 0 37 37 A M Register A 4 16 characters long Password a 4 16 characters long Pee i eg 10123456 SSN A numbers only no dashes Setup your account in order to get access to your classes Figure 7 Registration View Tuesday December 21 2010 1 15 39 A M Register Incorrest identification Number oOo Try Main Again Menu Setup your account in order to get access to your classes Figure 8 An error occurred while registering for a new account All views have the same header and footer While the header contains static information such as the date and time the footer displays specific instructions that are unique to each view On top of each view the username and rank of the current user are shown Once the user is logged in a new view will be shown This new view is called the dashboard Users ranked as students are given the ability to join new classes view classed that they have already joined or log out Shown in figure 9 Instructors on the other hand are given the ability to add new classes allow students to join their classes view the classes that they have already created and logout First time users will not have any classes in their lists and have to either join new classes if they are logged in as students or create new classes if they are logged in as instructors iTeach Tuesday December 2
32. modify grade or delete any of their exams student users may only use the exam view to take their exams Tuesday December 21 2010 8 08 48 P M User Roy Smith om Rank Instructor mas Sign Class ECON 4020 List out ADD A NEW EXAM Start 10 Dec 2010 Ends 11 Dec 2010 Information Notes Assignments Exams Communicate Grades Figure 23 An instructor view of the exams 18 iTeach Tuesday December 21 2010 8 08 26 P M User Anna Smith a pam Rank Student Classes sig n Class ECON 4020 List out Start 10 Dec 2010 ES Ends 11 Dec 2010 Grade 0 out of 100 Gata y Information Assignments Exams Communicate Grades Figure 24 A student view of the exams E Communicate The communicate button loads a communication view that shows the inbox of the current user The inbox is large container of all email messages received from other users that belong to the same class The current user can also use the Send New Email button Shown in figure 25 in order to be able to send emails to other users Clicking on the Send New Email button results in loading the view shown in figure 27 Tuesday December 21 2010 8 14 51 P M User Roy Smith p i pr Rank Instructor Sign Class ECON 4020 out Send New Email Anna Smith today 11 18 18 Nov 2010 Navid Sobhani Hi there 29 July 2010 Edward Cole Hi there 29 July 2010 E James Sanddomair Hi there 29 July 2010 E Information Notes Assignm
33. n the join button a request will be sent to the instructor The student is kindly asked to wait until the instructor approves his or her request The class will not be shown in the student s list until the request is approved http iteachs com Your request to join the class was sent to the Instructor and is awaiting to be approved Figure 11 A request to join a class C Add Student Instructors Only Instead of joining a class the dashboard gives instructors the option to add students to their classes The yellow button on the instructor s dashboard loads a sub view that lists all students requesting to join the classes that are being taught by the current user As Figure 12 illustrates Student Anna Smith has submitted a request to join the class named ece2300 The instructor is given the option to either allow the student to join the class or reject the student s request If the request 1s approved the student will have immediate access to the class The usage of requests gives instructors the ability to better control their classes and decide which users are allowed to join their classes 11 iTeach Tuesday December 21 2010 6 07 52 P M User Roy Smith Add Add Rank Instructor Class Student Sign out Add Student Welcome to your dashbord Figure 12 The Add Student View D Add Class Instructors Only As figure 13 shows the red button on the instructor s dashboard is completely differen
34. nd make sure that users do not submit empty forms 45 iTeach pending transaction register ph Handel the process of signing up for a new account 8 pap p gning up show php Manages all views and making sure that the user follows a certain chain of views Communicate with the database and provide required information to views 46
35. oring and Retrieving Data A Overview All assignments assessments notes emails and other data are stored in a remote database that is part of the dedicated server When a view wants to display specific information it sends an inquiry to the database using a socket The socket is an endpoint of a bidirectional inter process communication flow It uses a pre defined pair of username and password to establish a connection between the PHP file the View and 21 iTeach the database The socket also allows the PHP file to send SQL statements in order to collect data For instance the PHP file sends the unique identification number of instructor A and the keyword classes in order to get a list of classes that are taught by this instructor Information in the database is sorted into tables The job of the PHP file is to gather information from the database and connect them together For instance the table called Assignments holds the name of each assignment starting time ending time maximum possible grade and assignment description Another table called submissions holds students submissions When a student submits an assignment PHP saves it in the submissions table and then link it to the original assignment in the Assignments table B Entity Relationship Model ERM and Logical Design The following figure shows an abstract and conceptual representation of the data path in the database This modeling method produces a type of
36. ose individuals can use 1Teach to have access to their classes at any time of the day and are no longer obligated to spend the mornings on campus iTeach is also a green product that contributes greatly to the protection of our environment Because students who are using 1Teach have an electronic version of their course material they are less likely to purchase the printed one iTeach is not just an answer of an everyday problem but also a tool to redefine the classroom as we know it Additionally it makes the expanding payroll of educational institutions unnecessary 1Teach is an asynchronous technology that is a mode of online delivery where participants access course materials on their own schedule Participants are not required to be present at the same time The use of Internet to deliver course materials makes it possible to reach underserved populations who cannot attend a school that offers the educational services they desire Teach can turn production of content into a reusable and durable learning tool that does not require as much infrastructure 38 iTeach Acknowledgements This project would not have been possible without the support of Professor Al Davis The team members wish to express their gratitude to their professor who was abundantly helpful and offered invaluable assistance support and guidance 39 iTeach Bibliography 1 DevKit8000 product website http www embedinfo com english product devkit8000 asp
37. presents a single table and clearly illustrates the different fields that belong to the table A field has to have certain type collection type an attribute a validator a default value and an extra statement Figrure 32 shows the content of the assignments table which is meant to hold information about each assignment added by an instructor When an assignment is added the database generates a unique identification number for that assignment and save it in the id field As the figure shows the id field 1s designed to hold integers that has 255 digits or less The field does not have a collection or any attributes and can never be null The figure also states that the id field does not have a default value and is automatically incremented As a result assignments will have sequential id numbers The figure also states that different actions can be done to this field The id field can be sorted edited removed hidden and shown I Assignments Table Field Type Collation Attributes Null Default Extra Action id int 255 No auto_increment Pp A Ful T classID int 255 No f F T name varchar 500 latind_swedish_ci No fe OF A AT start date No ES X o end date Mo PO A T grade int 255 No El Y A Ful T desc varchar 5000 latind_swedish_ci No fe z E fu Figure 32 Assignment Table id is the primary key classID is a foreign key of id located in the classes table name name of assignment start when is the assignment going to
38. re pono SNDE A Thenmistor 10k at 250 Figure 49 Dual input power switching circuit from 2 Because the Lithium lon batteries are not stable and at risk of exploding if charged improperly we implemented safety designs to ensure the maximum protection One of the safety mechanisms in our design is input voltage protection up to 18V due to voltage detectors in the charger In addition diodes D1 and D2 prevent reverse current from flowing between inputs via the system load power path Furthermore Li ion batteries we use have internal protection circuit that inhibits discharging under 2 5V and overcharging above 4 2V 5 B DC to Dc Step up Converter A DC to DC step up converter is used in order to provide a 5V power to the DevKit8000 Shown in figure 51 is the schematic of our step up converter based on PTNO4050C pictured in figure 50 As specified in the documentations of the DevKit8000 the board draws approximately 500mA at 5V with the use of 4 3 LCD touch screen However since our system uses a 7 LCD touch screen we measured an actual power consumption of approximately 1A at SV As a result of this increase in power consumption we had to improve the initial design so that it becomes capable of supplying at least 1A at 5V Figure 50 PTNO4050C 35 iTeach Vi 1 5uH A PTN04050C 1 5 uH is O O C1 C4 22 uF nh uF ico 22 uF C5 Ceramic Required RseT Ie uF m Ceramic equire GND GND O O Figure 51
39. rmation view The white box in the figure is a textbox that does not only allow plain text but also HTML codes By clicking on the save button the instructor can save all changes and modifications to the class information 13 iTeach Tuesday December 21 2010 6 47 06 P M User Roy Smith Pa pea Rank Instructor Classes Sign Class Hist 4400 List out MIDE 4510 001 Fall 2010 Cross Listed with Hist 4400 and PolS 4400 Instructors 1 Peter von Sivers 2 Sheikh Safiullah 3 Peter Sluglett Introduction to World Religions 9 40 10 30 103 PAB Information Notes Assignments Exams Communicate Grades Figure 15 Class Information Instructor s View Notes This button leads to the loading of a new view called the notes view The notes view lists all PDF files and PowerPoint Slides that are related to this class The user is expected to click on the show button in order to read the material Figure 17 shows the content of Note 1 which is composed in a PDF file In order to upload these materials the instructor has to use his or her personal computer to access 1Teach website http www iteachs com The website provides a web based management system that acts like a drop box Files that are uploaded through the web based system are automatically shown on iTeach More information about the web based management system is provided in page 30 In order to prevent long waiting time 1Teach converts the content of the fi
40. s gets stored in the classes table the second row in figure 31 The first cell holds a randomly generated unique id for the class the second cell holds the same id 23 iTeach that was generated when the user signed up for the account 3984 the third cell holds the class name and the fourth cell holds the class description Because the same value is being stored in the id field in the users table and the instructorID field in the classes table an arrow was drawn between the two fields to indicate that they have some sort of relationship Once user A signs in to his dashboard an SQL statement gets executed Basically the statement passes the user id to the database along with the keyword classes The SQL engine receives the user id and starts looking for records in the classes table that has the same instructorID as the user id The SQL engine returns the search results to the view which displays the results to the user users classes id instructorID desc assignme aca name ena rade See submisstons exams gar Shi Ons disc classID desc disc topics ELOTE Ss Figure 31 Logical Diagram 24 iTeach C Data Dictionary In order to design the actual database a data dictionary has to be made Basically a data dictionary is an organized list of all tables and fields used to construct the database Figures 32 to 42 show all tables that shape the actual database Each figure re
41. ssignments button an assignment view like the one illustrated in figure 19 is shown Tuesday December 21 2010 7 12 08 P M User Roy Smith _ Ai Classes Sign List out ADD A NEW ASSIGNMENT Start 01 Jan 2010 Assignment 1 Ends 01 Jan 2010 Start 01 Jan 2010 Ends 00 0000 Information Notes Assignments Exams Communicate Grades Figure 18 An instructor view of the assignments 15 iTeach Tuesday December 21 2010 7 14 05 P M User Anna Smith rs aro Rank Student Classes Sig n Class ECON 4020 List out Start 01 Nov 2010 a x owt Ends 15 Nov 2010 Grade 0 out of 30 feo Information Assignments Exams Communicate Grades Figurel9 A student view of the assignment While instructors are given the option to modify grade or delete any given assignments Users that are ranked as students may only use the assignment view to do their assignment As figure 18 illustrates an instructor may also add a new assignment by clicking on the button located underneath the information block which brings up a different view Figure 20 shows a picture of the view that gets loaded The new view allows the student to determine when this new assignment is going to be available and when it is due Also it allows the instructor to assign a name and a grade for this assignment The big white textbox is meant for the assignment instructions An instructor can also grade a specific assignment by clicking on the grade button
42. student can do his or her assignments A check mark is only shown right next to an assignment that has been completed In order to complete an assignment a student has to click on the do assignment button next to the designated assignment Clicking on that button results in displaying a new view The new view which is shown in figure 22 allows the student to read the instructions and respond to them A student is expected to do each assignment before the due dates If an assignment is missed a grade of zero will be assigned 17 iTeach Tuesday December 21 2010 7 14 11 P M User Anna Smith Am i Rank Student Closes Sign Class ECON 4020 List out Instructions 1 explain IS LM Model economics and give some example for it 2 explain AS AD Model economics and give some example for it Information Notes Assignments Exams Communicate Grades Figure 22 A view to submit an assignment D Exams Clicking on the exam button will load a new view called the exams view The new view 1s identical to the assignments view It allows students to take their exams and also allows instructors to manage their exams By clicking on the exams button instructors will be shown an exam view that looks like the view shown in figure 23 On the other hand if a student clicks on the exams button an exam view like the one illustrated in figure 24 1s shown Exams are handled just like assignments While instructors are given the option to
43. t than the red button on the student s dashboard By clicking on the red button an instructor is given the ability to add a new class An instructor is asked to supply the class name and abbreviation in order to create the class Once created the class will be shown in the instructor s list of classes as well as the list of classes available to join on the student s dashboard Tuesday December 21 2010 6 14 09 P M User Roy Smith Add View Sign Rank Instructor Student Class out A Add Class Class Abbreviation ee CS1410 Class Name ee e g Intro to Computer Science Instructor Roy Smith Welcome to your dashbord Figure 13 The Add Student View E Sign Out The cyan button is designed to allow students and instructors to sign out By signing out the session is destroyed all pending actions are terminated and the user is redirected to the main view which is shown in figure 4 A user will have to login again in order to access his or her classes 12 iTeach User can simply access their classes from the dashboard by clicking on the view button The view button loads a completely different view that shows all information related to the designated class The new view is called the class view As figure 14 illustrates the class view redefines the block of information and the buttons that are located underneath the header Besides the user full name and rank the information block now displays
44. ty list of classes Each row of the list represents a single class The row contains the class abbreviation the class name and a view button By clicking on the view button of the desired class a new view will be loaded which contains the class information Besides the view button instructors only are shown a delete button for each class The functionality of this button is to drop the designated classes and erase its content from the database Students enrolled in a deleted class will no longer be able 10 iTeach to access the class In fact the class will not be shown in their lists Because each user is only shown a list of his her own classes a user that is ranked as an instructor can only view and delete his own classes Similarly a student that is ranked as a student can only view his her own classes and is not able to see classes that he hasn t been given access to B Join Class Students Only This view 1s only shown to users ranked as students It can be reached by clicking on the red button on the dashboard The view lists all classes that are found in the database Each row of the list represents a single class in the database The row contains the class name the class abbreviation the name of the instructor that 1s teaching and a join button If the student has joined a specific class the join button of that class will be disabled As a result a student can never join a class that he or she has already joined By clicking o

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