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ECE 477 Design Review Team 5  Fall 2009

ECE 477 Design Review Team 5  Fall 2009. Ben Carter – Jacqui Dickerson – Ian Oliver – Dennis Lee. Outline. Project overview Project-specific success criteria Block diagram Component selection rationale Packaging design Schematic and theory of operation PCB layout

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ECE 477 Design Review Team 5  Fall 2009

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  1. ECE 477 Design Review Team 5  Fall 2009 Ben Carter – Jacqui Dickerson – Ian Oliver – Dennis Lee

  2. Outline • Project overview • Project-specific success criteria • Block diagram • Component selection rationale • Packaging design • Schematic and theory of operation • PCB layout • Software design/development status • Project completion timeline • Questions / discussion

  3. Project Overview • Next generation communication system for vehicles • Simple, real-time visual communication • Multi-touch input • Driver’s gestures produce an output on LEDs around the perimeter of a car • Color-coded messages • Tri-color LEDs produce blue, green, yellow, orange, and red outputs

  4. Project-Specific Success Criteria • 1. The ability to determine direction of a finger sweep on a touch pad array. • 2. The ability to determine the number of fingers used on a touch pad array. • 3. The ability to produce at least two meaningful LED patterns. • 4. The ability to determine force of acceleration on a car. • 5. The ability to wirelessly transmit data from the multi-touch signal processor to the LED cluster controllers

  5. 30 Capacitive Touch Inputs 30 Capacitive Touch Inputs 30 Capacitive Touch Inputs 30 Capacitive Touch Inputs 30 30 30 30 5 More CapSense Controller 0 CapSense Controller 1 CapSense Controller 7 CapSense Controller 8 I2C Microcontroller/DSP (Gesture Recognition) I2C LED Driver 0 LED Driver 3 UART Tx 2 more 15 15 RF Transmitter 5 tricolor LEDs 5 tricolor LEDs RF Communication @ 315MHz RF Receiver 0V – 5V analog UART Rx Microcontroller 0 (LED Control) Accelerometer I2C LED Driver 0 LED Driver 13 12 more 15 15 5 tricolor LEDs 5 tricolor LEDs

  6. Component Selection Rationale • dsPIC33FJ256MC710 • Required a lot of RAM & moderate Flash • Availability w/ many suppliers • PIC18F2525 • Required I2C interfacing & sizeable Flash • dsPIC chosen; staying w/ same family • LED Drivers (TLC59116) • Required 15 PWM channels to control 5 tri-color LEDs • Ability to control up to 16 PWM channels

  7. Component Selection Rationale • RF Transmitter/Receiver (MO-SAWR-AS315M/MO-RX3400-A315M) • Required 315MHz • Provides up to 100m of transmission • Accelerometer (MMA1270EG) • Required 2.5g over 3 axes at 5V • SOIC packaging for ease of soldering • Capacitive Touch Input Controllers (CY8C20666) • Required multiple touches to be realized • Donated by Purdue Alum & Cypress FAE

  8. Packaging Design Constraints • Will not be demonstrating on a full size vehicle • Large RC car will house one LED Output Cluster • User Interface Module will be exterior to car, powered by an AC wall wart • Full size design would consist of several LED Output Clusters, weatherproofing, and a scheme for mounting the User Interface Module to a steering wheel

  9. Packaging Design – User Interface Module • 8”x8”x1-1/2” • *variable • 20 user feedback LEDs replicate LED output on RC car • Front will be denoted with a print of a black & white top-view sketch of a car • 5”x6” capacitive touch area is uncovered PCB • External 2” antenna for RF transmission to RC car

  10. Packaging Design - LED Output Vehicle • 32”x12”x10” • 12 LEDs for front/back • 23 LEDs for sides • =>70 tricolor LEDs • ~1LED per 1.5” • LEDs mounted on 5 apiece on 14 PCBs • LED Panel PCBs mounted on inside of car’s exterior plastic • Holes will need to be drilled through car’s exterior for LEDs to show through • LEDs will extend ~3/4” off PCB, so will be able to flex and fit through

  11. Schematic/Theory of Operation • duplicate this slide as necessary for each major block of your design

  12. Schematic/Theory of Operation • Capacitive sensor is a pair of plates/electrodes • There is also capacitance between finger and electrodes • A sensor detects change in capacitance when finger is present

  13. Schematic/Theory of Operation • Capacitive buttons are on one side of the board • The microcontroller (PSoC) is on the other side • A plastic/glass overlay (1-5mm thick) covers buttons

  14. Schematic/Theory of Operation • The capacitive sensing microcontroller is the PSoC • Each PSoC can scan buttons and communicate over I2C • Our PSoC will communicate with a DSP to process inputs

  15. Schematic/Theory of Operation • Flow of input to output: • CapSense microcontroller (PSoC) reads input from buttons – 9 PSoCs to sense 120 buttons total • DSP (dsPIC) reads PSoCs to interpret input, sends commands to LED controller wirelessly • LED controller (PIC18) coordinates LED drivers to produce output patterns

  16. RST to PSoCs dsPIC I2C to PSoCs and TLC RF Tx to PIC18

  17. PCB Layout – TLC Board • Main Components • 5 LEDs and a single TLC driver chip • Other Components • 5 Resistors, 5 Headers, 1 Capacitor • 0.5” x 5” • Tight space required careful routing

  18. PCB Layout – TLC Board

  19. PCB Layout – PIC18 Board Main Components PIC18, RF Receiver, Power Supply Other Components Switch, 18 Headers, 3 Resistors, 4 Capacitors, 1 Inductor, and 1 Diode 1.4” x 5” Plenty of space allowed for easy routing and the ability to actually minimize the area of the board

  20. PCB Layout – PIC18 Board

  21. PCB Layout – dsPic Board Main Components dsPIC, RF Transmitter, Power Supply Other Components 10 Capacitors, 16 Resistors, 1 Switch, and 17 Headers 2” x 7” section of the larger User Interface Board Lots of space allowed for large heat sink and ease of routing

  22. PCB Layout – dsPic Board

  23. PCB Layout – MultiTouch Board Main Components 1 Cypress PSOC chip and 30 CapSense Pads Other Components 34 Resistors, 2 Headers, 1 Capacitor, and 1 OR gate 5” x 6” Section of the larger User Interface Board Via on each CapSense pad made routing very difficult

  24. PCB Layout – MultiTouch Board

  25. Software Design/Development Status • PIC18F(LED Output Controller) • LED Output Coordination • Establishing Timer0 interrupts, I2C interface • dsPIC33F(Multiple Touch Processor) • Finger Count Detection • Area vs. discrete contacts • Direction Vector Calculation • Track angle of finger swipe • CY8C(CapSense Controller) • Activation of CapSense block, record data, then communication of data over I2C

  26. Project Completion Timeline

  27. Questions / Discussion

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