Report - Machine Intelligence Lab
Contents
1. Infrared Transmitter Infrared receiver i Touch Pad E Driver PICASO GFX2 Wireless Transceiver Bluetooth DC Power Source Wall Wart Lithium Ion Charging IC E Figure 5 LCD Driver Chip Software Flowchart 20 Apr 11 University of Florida Electrical amp Computer Engineering Page 7 13 EEL 4924 Spring 2011 Product Design Report uTouch initialize python process and load Program Start python modules Process 2 Initialize and set driver parameters Bluetooth Driver Open Bluetooth Connection Bluetooth Command Mouse Change Bluetooth Driver Process 1 Gui Init Com Port Opened Set Oriver Parameters Load default profile Cam Port Clased Gui State Change Close Bluetooth Serialize Profile Oriver Change to Hardrive Load Profile Parameters Perform Action Using Win32 API Figure 6 Python Windows Computer Program Flowchart initialize IR Input amp Output ADC Timers AO amp A1 SD Card RGB LED and LCD Controller interface Delay to wait for IR amplifier input to settle and for LCD controller to turn on RGB LED Yellow Reset all flags Turn on Learning Interrupt Reset all flags Check for SD Card Save IR code to SD Card Clear IR code buffer Turn on RX Interrupt RGB LED Cyan Reset all flags Turn on Transmit Interrupt oo Panaming terme Turn on LED masked by high or low of IR signal End of IR Code T2. and then transmitting the commands using a high output infrared light emitting diode Our main objectives were size portability usability and low power consumption We designed uTouch with these aspects in mind carefully selecting appropriate parts that would lead to a complete final product A 16 bit full color touchscreen LCD was chosen for its compactness moderate power usage and versatility This full color touchscreen LCD allows uTouch to be presented to a user in an intuitive and easy to use manner Since size portability and power were also main concerns a large part of the design went into battery management We chose to use two 1000mAh rated 3 7V Lithium Polymer batteries in series to meet our need for a power supply voltage over 5V The voltage was designed to be a few volts over the needed 5V so that it could be regulated to a steady voltage and to lessen the impact of the battery discharge This 2 cell Lithium Polymer battery pack is charged using a 2 Cell Lithium Polymer Battery Charging Integrated Circuit from Texas Instruments BQ2057 The charging circuit functions in such a way as to charge the battery pack at a constant voltage with a temperature regulated trickle down current The main concept is that the voltage across the battery pack stays the same while the current is slowly decreased as the battery charges An LED indicates the status of the charger which automatically turns off when charging is complete Another concern for
3. building such a small compact unit was temperature to take care of this aspect we incorporated a thermistor into the charging circuit to monitor the battery pack temperature and to suspend charging when higher temperatures are reached The focal point of our IR learning and transmission was accomplished using an MSP430F2272 This chip was chosen for its built in modules and exceptionally low power consumption A major obstacle was determining how to learn permanently save and then transmit an IR code Learning the IR code was accomplished using a phototransistor and a custom built low pass amplifier circuit and reading that output to the microprocessor through an Analog to Digital Convertor ADC An external SD Card was interfaced into the device in order to save a large number of IR codes while the device is functioning retain them when the device is not powered In order to accomplish the storing and reading from an SD card the SD protocol had to be studied and implemented Once the IR code is read back into the MSP temporary storage it is modulated and sent back out at between 38kHz and 40kHz the standard is 38kHz and nearly 85 of all IR devices use this range of modulation frequency The LCD screen loads images from a micro SD card Each image has regions of detection hardcoded in the LCD s flash The driver for the system is a PICASO GFX2 processor that is coded in 4dgl a proprietary programming language The logic of the LCD screen is Uni
4. deoasSsunneae sec ouacedenssaceatedssassenanatens 13 Propced Mine ine esaa A A 13 List of Figures Fig re 1 Apple Wireless Multi Touch Pad irerssesiiessanisri ena EEE 3 Figure 2 Samsung Multifunction Touchscreen Learning Remote ccccececccccccceeeeeeeeeeeeeeeeeeeees 4 Fiure o Apple iPhone 4 52 GB NMOGE scrscactesretieseni dance eae tae aais 4 Figure 4 uTouch Detailed Functional Block Diagram cc ccccnnnnneeeeeseeeeeeeececeeeceeeeeeeeaaaaaas 5 Figure 5 LCD Driver Software Flowchart esencan sadn deatacsantenapewsvadavesasedaadedentcessatecetes 6 Figure 6 Python Windows Computer Program Flowchart 0 0 0 0 ceeeecccccccccceeeeeeseeseseeeeeeeeceeeeeeeeeeenaas 7 Figure 7 MSP430F227 2 Software Flowchart E 7 Fiore 8 Picture OF 0 LOuUCK Device Fro erene a T T Menderes 9 Fieure 9 Picture of il ouch Device Back oseese a T ees 9 Freure 0 Gant C haror Timeline soea e a E N 10 Pisure lil Gantt Charcot Timen ean sueesenistutsaicheiecni ial ease secessziatuteaacneimens teh ces nace 10 Pieure 12 Gantt ChartOr Time He senii vu steexsthond debasenteresgetida van T A deers 11 Figures T3 Gantt Chart or TIme line esen E E sien ientseondie ise 11 Pieure TA Gantt Chart or Timeline seann a E E E N E E E 12 Fiure 15 Gante Charr or BED er NE soa T E N 12 Fiene To Gant Chart or Time Foe eee ae ae amen tr rte a etre Deter 12 Foure 7 Gante Eharr or Time Ine enaena EANA 13 List of Tables Table Distribution of Labor eesnimena e d
5. EEL 4924 Electrical Engineering Design Senior Design Final Design Report 19 April 2011 Project Name uTouch Team Members Name Issam Bouter Name Constantine Metropulos Email sambouter gmail com Email cgmetropulos ufl edu Phone 561 685 7455 Phone 561 251 2170 Project Abstract This project describes the functionality and building of a wireless touch pad universal controller with a full color LCD The point of this is to give the user visual feedback simple device navigation and to allow room functionality extensions The functionality of the device includes several infrared interfaces to be used as a universal remote control for several household entertainment devices a GUI with easy peripheral parameter settings and the ability to use the device as a computer mouse keyboard and shortcut remote through Bluetooth University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 2 13 Product Design Report uTouch Table of Contents Product Features amd OD CCUVES oreista E E E RA 3 Analysis of Competitive Products ssesacene2sns ssadsvancsacacesuaessbendennlateesedabandiavedesuiedeiiendsnntibecsedasendiatedsseeaien 3 Concept and TEChnolocy Selection acsvesiniaiedine tas doaiavedndescataiaiaia ness dala web nderes drained eddies 4 PrO CEAT IT Oa E E E O AaRea as eoa es aeaed 5 D Omo LADO enra E T ee ee 7 User Manual sosisini enna E teen eae one eae E heen eshte 8 Bof Mieris BOND e O ste
6. University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 9 13 Product Design Report uTouch Figure 8 Picture of uTouch Device Front Figure 9 Picture of uTouch Device Back The flow of the LCD software is described above in Figure 5 this flow determines which menu is displayed on the LCD screen for the user The following figures are the completely list of menus available to the user University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 10 13 Product Design Report uTouch Figure 10 TV Infrared controller screen Each button can be programmed to learn an infrared code Figure 11 Help screen Describes the functionality of sections for the mouse interface state University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 11 13 Product Design Report uTouch Previous Figure 12 Number Pad Infrared controller screen Each button can be programmed to learn an infrared code Figure 13 Mouse interface state Changes of touch on this screen are sent to Bluetooth as a mouse change command This has a menu button for personalizing this state help button shortcut buttons and the keyboard changes the state to the keyboard interface state University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 12 13 Product Design Report uTouch oe i
7. e Python windows computer program can be found in Figure 6 The Python program consists of a Bluetooth driver which interprets received commands into mouse keyboard and shortcut actions alongside a GUI process which serializes user input to the hard drive and communicates it to the Bluetooth process through a cue The MSP430 will then control the Infrared IR input and output depending on the command received from the PICASO GFX2 processor The MSP continuously runs a main loop to check for flags set When the learning flag is set the MSP reads the IR input through an ADC channel from a custom designed low pass amplifier circuit using a phototransistor The start of the IR code is found and the following code is saved to ram in the MSP The MSP then recognizes that there is a code waiting to be saved to the SD Card and proceeds to save the code permanently on the external SD Card Once the IR code has been saved to the memory card the focus returns to the LCD driver which will repeat its functionality previously described or can also send the MSP a transmit command When this transmit command is received the MSP will read the IR code off of the external SD Card into onboard temporary memory and will transmit the IR code through a high power IR LED The flowchart of the MSP program functionality can be seen in Figure 7 University of Florida EEL 4924 Spring 2011 Electrical amp Computer Engineering Page 6 13 Product Design Report uTouch
8. eaths a R T 6 Maple 2 BUO Wate tla is BOM eanne aaa Peed eae eles a a ere eS S University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 3 13 Product Design Report uTouch Product Features and Objectives This project incorporates elements of both electrical and computer engineering and computer science design The application domain for this project spans the areas of wireless communication universal controllers human interface technologies microprocessor applications and remote computer access and control The main purpose of this project is to develop an efficient low power wireless touch computer and infrared device controller using an LCD screen and a touch pad This means that power consumption is important and was a key design limitation The microprocessor selected needed to run at high enough speeds to communicate with multiple peripherals For its exceptionally low power consumption and debugging flexibility the MSP430F2272 was chosen Size is also an important consideration as this device is intended to be portable Careful consideration was placed on final product size during the design implementation and construction of the system The final uTouch device module measures approximately 4 25 x3 75 x1 25 which is well under our aim of the largest size being 10 x7 x2 With the Lithium Polymer batteries currently used we are able to achieve a operation time of about 2 hour
9. lt Co mp IR 9 foams Figure 14 Computer Infrared controller screen Each button can be programmed to learn an infrared code Figure 15 VCR Infrared controller screen Each button can be programmed to learn an infrared code BE ERWE Ls ak D Figure 16 DVD Infrared controller screen Each button can be programmed to learn an infrared code University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 13 13 Product Design Report uTouch Bill of Materials BOM Gantt Chart Project Schedule The following figure Figure 10 displays the project timeline for the completion of the project in the form of a Gantt Chart GANTT o Ss anuary 2011 February 2011 March 2011 April 2011 1 2 3 4 5 6 7 8 9 10 14 15 16 ti H2 3 Preliminary Research Obtain Materials and Parts Project Component Design Color LCD amp Touchpad System Bluetooth Module Computer Bluetooth Drivers amp Software infrared Learning amp Transmitting Various Input Buttons amp Devices Battery Charging System Integration PCB Design amp Construction Test amp Debug Figure 17 Gantt Chart of Projected Timeline
10. s which is about half of our initial desired time of four hours but with an upgrade from two 1000maH batteries to 2000maH batteries the operation time can approximately double Analysis of Competitive Products Currently the only comparable products in the commercial market are the Apple wireless multi touch pad priced at 69 00 shown in Figure 1 below the Samsung Multifunction Touchscreen Learning Remote priced at 299 99 shown in Figure 2 below and the Apple iPhone 4 32GB model priced at 299 00 shown in Figure 3 shown below However our product will differentiate itself from the all of these products by bridging the gap between them by controlling both infrared and Bluetooth devices We hope to develop a GUI interface that will allow simple user interface with parameter setting and visual feedback Even though the uTouch controller has the functionality of multiple commercially available products it could be sold at an outstanding price of about 200 Figure 1 Apple Wireless Multi Touch Pad University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 4 13 Product Design Report uTouch SAMSUNG Figure 2 Samsung Multifunction Figure 3 Apple iPhone 4 32GB model Touchscreen Learning Remote Concept and Technology Selection The main objective of our project was to build a complete intelligent remote control that could be used to control any Infrared device by learning infrared codes
11. urn off IR LED Reset all flags Turn off RGB LED Turn off Transmit interrupt Enable RX Interrupt End of interrupt Return to Main Program Sample IR input index clear count Stop Learning Set Done Flag End of interrupt Turn off Learning Interrupt Return to Main Program Turn RGB LED Off Figure 7 MSP430F2272 Software Flowchart Profile Change Change Profile file 20 Apr 11 University of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 8 13 Product Design Report uTouch Division of Labor The following is a breakdown of each team member s projected labor by approximate percentage sa Boer caste eo O oos a E E Infrared Learning amp Transmitting Various Buttons amp Devices eo a Semin E PewDein econsanion E recep Table 1 Distribution of Labor User Manual The uTouch Universal Learning Remote Control is incased in a clear plastic case to allow the user to enjoy the technical aspect of the design The clear case also allows for the secure placement of LEDs on the inside of the case while still being visible from the outside Pictures of the front of the uTouch controller the side with the full color LCD Figure 8 and the back of device Figure 9 give a general idea of the size and look of the device The screen shown in Figure 8 is the Main Menu screen of the LCD controller that allows the user to choose which feature they would like to use
12. versity of Florida EEL 4924 Spring 2011 20 Apr 11 Electrical amp Computer Engineering Page 5 13 Product Design Report uTouch state machine based Each image is loaded and regions in the touchscreen cause different screens to be loaded or spi commands to be sent out Some on the go graphics rendering happens for the mouse state which gives the user some visual feedback The LCD spi lines are connected to the Bluetooth device as well as the msp430 There is an identifier for each command that both the msp430 and the computer have to decipher and react accordingly The baud rate of the Bluetooth is 115200 so each transmission to the computer happens very quickly Project Architecture The system level architectural block diagram in Figure 4 displays the overall connections and architecture of our system The LCD driver PICASO GFX2 controls the 16 bit full color LCD screen to display the uTouch interface to the user The flowcharts for the architecture and operation of this interface can be found in Figures 5 This figure shows the LCD driver chip software flowchart The graphical displays that are presented to the user can be found in the User Manual section of the paper The driver chip then processes the users commands via the resistive touchpad From there the driver chip will either control the Bluetooth module to communicate with the Python windows program it will also send commands to the MSP430 F2272 microcontroller The flowchart for th
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