Ryan McLean John-Michael Mulesa Joe Perrin Zach Schoenberger Formal Design Review

Ryan McLeanJohn-Michael Mulesa

Joe PerrinZach Schoenberger

Formal Design Review

• Project Overview

• Project-Specific Success Criteria

• Block Diagram

• Component Selection Rationale

• Packaging Design

• Schematic & Theory of Operation

• PCB Layout & Considerations

• Software Design & Development Status

• Project Completion Timeline

[Outline]

• GPS-Based Head-Up Display– Multi-mode driving aid– GPS navigation– Google Maps® (GSM chip)– Performance data– Color display

• Infinite focus• Dashboard-mounted

[Project Overview]

1. An ability to display speed and elevation (obtained using GPS).

2. An ability to display heading and G-force (obtained using compass and accelerometer).

3. An ability to toggle map overlays (obtained via GSM modem from Google Maps).

4. An ability to project a heads-up display focused at infinity.5. An ability to change display brightness and vertical

position.

[Proposed PSSCs]

[Block Diagram]

Component Selection Rationale

Packaging Design

• Size– Plenty to pack inside!– Limited external space

• Color– Matte black– Reduce/eliminate glare

• Material– Aluminum construction– Electronic components not affected

[Packaging Design]

[Packaging Design]

[Packaging Design]

[Packaging Design]

[Packaging Design]

Schematic & Theory of Operation

• GM862-GPS – GPS/GSM Unit– 3.5V operation– SCI connection to microcontroller– Query-based data retrieval• Query sent from microcontroller• Formatted, query-based data returned

[Schematic & Theory of Operation]

• HMC6352 – Digital Compass– 3.5V operation– I2C connection to microcontroller– Pass an address over I2C interface to listen to

compass module

[Schematic & Theory of Operation]

• ADXL345 – Accelerometer– 3.5V operation– I2C connection to microcontroller– Pass an address over I2C interface to listen to

accelerometer– Both accelerometer and compass are connected

to one I2C bus

[Schematic & Theory of Operation]

• FT232RL – USB to RS232 Adapter– 3.5VCCIO

– 5VCC – SCI connection to microcontroller– USB connection to ARM board

[Schematic & Theory of Operation]

• ATXMega16D4– 3.5V operation– 12MHz frequency– Using:

• 2 SCI buses• 1 I2C bus• 1 PWM• 1 ADC• 4 GPIO

[Schematic & Theory of Operation]

PCB Layout & Considerations

Peripheral Considerations• Keep I2C components close together• Keep USB to RS232 IC close to USB connector• Headers to access I/O traces• Test points on power rails to quickly measure

voltage• GSM/GPS unit can draw 2A

– Uses direct connection to ground and power– Assumes no vias

[PCB Layout & Considerations]

Microcontroller Considerations• Locate microcontroller near middle of board• Use 0.1μF decoupling capacitor for each

power-ground pair• Small current draw• Internal oscillator

[PCB Layout & Considerations]

Power Considerations• Max current draw is about 2.2A– Traces will have to be able to cope with current

draw• Approximately 1.1mm traces

– Need sufficient bulk capacitance– Minimize vias on power rails

[PCB Layout & Considerations]

Software Design & Development Status

• Polling the peripherals– Timer interrupt driven polling of the peripherals

• Accelerometer• Digital compass• Control knob for mirror

– RTI driven peripherals• All external buttons

• Controls Servo Motor– PWM signal used to control servo to adjust mirror– Based on change in Control Knob

• GSM Data– Retrieves data constantly based on SCI interrupts – Immediately signals ARM board and sends data

[Microcontroller]

• Interfacing with the ARM board– Forwards data about peripherals upon request• Based on custom instruction set over SCI

– ARM board can ask for data about specific peripheral

– Interrupt driven

– Forwards GSM data over SCI every time new data is received

[Microcontroller]

• Communicates with microcontroller to get raw data– Accelerometer, Digital Compass data

• Deals with all image manipulation• Sends final image to projector

[ARM Board]

Project Completion Timeline

[Project Completion Timeline]

Week Milestone Items Due

8 • Package design to EE shop• PCB, schematic revisions complete Formal Design Review

9• Image display software started• Microcontroller software started• Projector ordered

Final PCBFinal SchematicProof-of-Parts

10 Spring Break

11• MCU-to-ARM communication• Package complete• Send/receive via GSM modem verified• Receive GPS data verified

Software Design Narrative

12 • Image display software finished• PCB assembled, tested Patent Liability Analysis

[Project Completion Timeline]

Week Milestone Items Due

13 • External control functionality• Projector, mirror mounted in package Reliability and Safety Analysis

14 • MCU, ARM mounted in package• Initial “full-package” testing

Ethical and Environmental Impact Analysis

15• Dashboard mount fabrication • Vehicle testing• Final documentation

User Manual

16 • Guest vehicle demonstrations• Project complete PSSC Demos

• Project Overview

• Project-Specific Success Criteria

• Block Diagram

• Component Selection Rationale

• Packaging Design

• Schematic & Theory of Operation

• PCB Layout

• Software Design & Development Status

• Project Completion Timeline

[Summary]

[Questions?]