ECE 477 Design Review ECE 477 Design Review Team 5 Team 5 Fall 2009 Fall 2009

Ben Carter – Jacqui Dickerson – Ian Oliver – Dennis Lee

OutlineOutline• Project overview Project overview • Project-specific success criteriaProject-specific success criteria• Block diagramBlock diagram• Component selection rationaleComponent selection rationale• Packaging designPackaging design• Schematic and theory of operationSchematic and theory of operation• PCB layoutPCB layout• Software design/development statusSoftware design/development status• Project completion timelineProject completion timeline• Questions / discussionQuestions / discussion

Project OverviewProject 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

Project-Specific Success CriteriaProject-Specific Success Criteria

• 1. The ability to determine direction of a finger sweep on 1. The ability to determine direction of a finger sweep on a touch pad array.a touch pad array.

• 2. The ability to determine the number of fingers used 2. The ability to determine the number of fingers used on a touch pad array.on a touch pad array.

• 3. The ability to produce at least two meaningful LED 3. The ability to produce at least two meaningful LED patterns.patterns.

• 4. The ability to determine force of acceleration on a car. 4. The ability to determine force of acceleration on a car. • 5. The ability to wirelessly transmit data from the multi-5. The ability to wirelessly transmit data from the multi-

touch signal processor to the LED cluster controllerstouch signal processor to the LED cluster controllers

CapSense Controller 0

Microcontroller/DSP (Gesture

Recognition)

30 Capacitive Touch Inputs

30

CapSense Controller 1

30 Capacitive Touch Inputs

30

CapSense Controller 7

30 Capacitive Touch Inputs

30

CapSense Controller 8

30 Capacitive Touch Inputs

30

I2C

RF Transmitter

LED Driver 0

Microcontroller 0 (LED Control)

15

LED Driver 13

1512 more

5 tricolor LEDs

5 tricolor LEDs

I2C

RF Receiver

RF Communication @ 315MHz

LED Driver 0

15

LED Driver 3

152 more

5 tricolor LEDs

5 tricolor LEDs

I2C

Accelerometer

5 More

UART Tx

UART Rx0V – 5V analog

Component Selection RationaleComponent Selection Rationale

• dsPIC33FJ256MC710dsPIC33FJ256MC710 – Required a lot of RAM & moderate FlashRequired a lot of RAM & moderate Flash– Availability w/ many suppliersAvailability w/ many suppliers

• PIC18F2525PIC18F2525– Required I2C interfacing & sizeable FlashRequired I2C interfacing & sizeable Flash– dsPIC chosen; staying w/ same familydsPIC chosen; staying w/ same family

• LED Drivers (TLC59116)LED Drivers (TLC59116)– Required 15 PWM channels to control 5 tri-Required 15 PWM channels to control 5 tri-

color LEDscolor LEDs– Ability to control up to 16 PWM channelsAbility to control up to 16 PWM channels

Component Selection RationaleComponent 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 Capacitive Touch Input Controllers (CY8C20666(CY8C20666)– Required multiple touches to be realized– Donated by Purdue Alum & Cypress FAE

Packaging Design ConstraintsPackaging Design Constraints

• Will not be demonstrating on a full size Will not be demonstrating on a full size vehiclevehicle– Large RC car will house one LED Output Large RC car will house one LED Output

ClusterCluster– User Interface Module will be exterior to User Interface Module will be exterior to

car, powered by an AC wall wartcar, powered by an AC wall wart• Full size design would consist of several LED Full size design would consist of several LED

Output Clusters, weatherproofing, and a Output Clusters, weatherproofing, and a scheme for mounting the User Interface scheme for mounting the User Interface Module to a steering wheelModule to a steering wheel

Packaging Design – User Packaging Design – User Interface ModuleInterface Module• 8”x8”x1-1/2”8”x8”x1-1/2”

– *variable*variable

• 20 user feedback LEDs 20 user feedback LEDs replicate LED output on RC replicate LED output on RC carcar

• Front will be denoted with a Front will be denoted with a print of a black & white top-print of a black & white top-view sketch of a carview sketch of a car

• 5”x6” capacitive touch area 5”x6” capacitive touch area is uncovered PCBis uncovered PCB

• External 2” antenna for RF External 2” antenna for RF transmission to RC cartransmission to RC car

Packaging Design - LED Output Packaging Design - LED Output VehicleVehicle• 32”x12”x10”32”x12”x10”

• 12 LEDs for front/back12 LEDs for front/back

• 23 LEDs for sides23 LEDs for sides– =>70 tricolor LEDs=>70 tricolor LEDs– ~1LED per 1.5”~1LED per 1.5”

• LEDs mounted on 5 apiece on LEDs mounted on 5 apiece on 14 PCBs14 PCBs

• LED Panel PCBs mounted on LED Panel PCBs mounted on inside of car’s exterior plasticinside of car’s exterior plastic

• Holes will need to be drilled Holes will need to be drilled through car’s exterior for LEDs through car’s exterior for LEDs to show throughto show through

• LEDs will extend ~3/4” off PCB, LEDs will extend ~3/4” off PCB, so will be able to flex and fit so will be able to flex and fit throughthrough

Schematic/Theory of OperationSchematic/Theory of Operation

• duplicate this slide as necessary for each duplicate this slide as necessary for each major block of your designmajor block of your design

Schematic/Theory of OperationSchematic/Theory of Operation

• Capacitive sensor is a Capacitive sensor is a pair of pair of plates/electrodesplates/electrodes

• There is also There is also capacitance between capacitance between finger and electrodesfinger and electrodes

• A sensor detects A sensor detects change in capacitance change in capacitance when finger is presentwhen finger is present

Schematic/Theory of OperationSchematic/Theory of Operation

• Capacitive buttons are Capacitive buttons are on one side of the on one side of the boardboard

• The microcontroller The microcontroller (PSoC) is on the other (PSoC) is on the other sideside

• A plastic/glass overlay A plastic/glass overlay (1-5mm thick) covers (1-5mm thick) covers buttonsbuttons

Schematic/Theory of OperationSchematic/Theory of Operation

• The capacitive sensing The capacitive sensing microcontroller is the microcontroller is the PSoCPSoC

• Each PSoC can scan Each PSoC can scan buttons and buttons and communicate over I2Ccommunicate over I2C

• Our PSoC will Our PSoC will communicate with a DSP communicate with a DSP to process inputsto process inputs

Schematic/Theory of OperationSchematic/Theory of Operation

• Flow of input to output:Flow of input to output:– CapSense microcontroller (PSoC) reads CapSense microcontroller (PSoC) reads

input from buttons – 9 PSoCs to sense 120 input from buttons – 9 PSoCs to sense 120 buttons totalbuttons total

– DSP (dsPIC) reads PSoCs to interpret DSP (dsPIC) reads PSoCs to interpret input, sends commands to LED controller input, sends commands to LED controller wirelesslywirelessly

– LED controller (PIC18) coordinates LED LED controller (PIC18) coordinates LED drivers to produce output patternsdrivers to produce output patterns

dsPIC

RST to PSoCs

I2C to PSoCs and TLC

RF Tx to PIC18

PCB Layout – TLC BoardPCB Layout – TLC Board

• Main ComponentsMain Components– 5 LEDs and a single TLC driver chip5 LEDs and a single TLC driver chip

• Other ComponentsOther Components– 5 Resistors, 5 Headers, 1 Capacitor5 Resistors, 5 Headers, 1 Capacitor

• 0.5” x 5”0.5” x 5”• Tight space required careful routingTight space required careful routing

PCB Layout – TLC BoardPCB Layout – TLC Board

PCB Layout – PIC18 BoardPCB Layout – PIC18 Board

• Main ComponentsMain Components– PIC18, RF Receiver, Power SupplyPIC18, RF Receiver, Power Supply

• Other ComponentsOther Components– Switch, 18 Headers, 3 Resistors, 4 Switch, 18 Headers, 3 Resistors, 4

Capacitors, 1 Inductor, and 1 DiodeCapacitors, 1 Inductor, and 1 Diode• 1.4” x 5”1.4” x 5”• Plenty of space allowed for easy routing and Plenty of space allowed for easy routing and

the ability to actually minimize the area of the the ability to actually minimize the area of the boardboard

PCB Layout – PIC18 BoardPCB Layout – PIC18 Board

PCB Layout – dsPic BoardPCB Layout – dsPic Board

• Main ComponentsMain Components– dsPIC, RF Transmitter, Power SupplydsPIC, RF Transmitter, Power Supply

• Other ComponentsOther Components– 10 Capacitors, 16 Resistors, 1 Switch, and 10 Capacitors, 16 Resistors, 1 Switch, and

17 Headers17 Headers• 2” x 7” section of the larger User Interface 2” x 7” section of the larger User Interface

BoardBoard• Lots of space allowed for large heat sink and Lots of space allowed for large heat sink and

ease of routingease of routing

PCB Layout – dsPic BoardPCB Layout – dsPic Board

PCB Layout – MultiTouch BoardPCB Layout – MultiTouch Board

• Main ComponentsMain Components– 1 Cypress PSOC chip and 30 CapSense 1 Cypress PSOC chip and 30 CapSense

PadsPads• Other ComponentsOther Components

– 34 Resistors, 2 Headers, 1 Capacitor, and 1 34 Resistors, 2 Headers, 1 Capacitor, and 1 OR gateOR gate

• 5” x 6” Section of the larger User Interface 5” x 6” Section of the larger User Interface BoardBoard

• Via on each CapSense pad made routing Via on each CapSense pad made routing very difficultvery difficult

PCB Layout – MultiTouch BoardPCB Layout – MultiTouch Board

Software Design/Development StatusSoftware Design/Development Status

• PIC18F(LED Output Controller)PIC18F(LED Output Controller)– LED Output CoordinationLED Output Coordination

• Establishing Timer0 interrupts, I2C interfaceEstablishing Timer0 interrupts, I2C interface• dsPIC33F(Multiple Touch Processor)dsPIC33F(Multiple Touch Processor)

– Finger Count DetectionFinger Count Detection• Area vs. discrete contactsArea vs. discrete contacts

– Direction Vector CalculationDirection Vector Calculation• Track angle of finger swipeTrack angle of finger swipe

• CY8C(CapSense Controller)CY8C(CapSense Controller)– Activation of CapSense block, record data, then Activation of CapSense block, record data, then

communication of data over I2Ccommunication of data over I2C

Project Completion TimelineProject Completion Timeline

 

Week 8

Week 9

Week 10

Week 11

Week 12

Week 13

Week 14

Week 15

Week 16

  12-Oct 19-Oct 26-Oct 2-Nov 9-Nov 16-Nov 23-Nov 30-Nov 7-Dec

Design Review                  

Proof of Parts                  

Constr. LED Output Controller PCB                  

Constr. LED Panel PCB                  

Constr. User Interface Module                  

RC Car Construction                  

LED Output Interface Software                  

LED Output Coordination Software                  

CY8C CapSense Software                  

User Module Interface Software                  

Multiple Touch Finger Detect Software                  

Multiple Touch Direction Vector Software                  

Questions / DiscussionQuestions / Discussion