1. ECE 477 Design Review Team 6 - Spring 2012

2. Presentation 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
GNMS is a multi-touch capable surface designed for use with games and other media. The surface is table-sized for an immersing computing experience.

4. Project-Specific Success Criteria
An ability to interpret and track touch signals using Frustrated Total Internal Reflection (FTIR) from the Atom motherboard.
An ability to run applications and display them appropriately on a screen.
An ability to send control signals to the projector using internal IR signals similar to a remote control.
An ability to monitor internal temperature and dynamically control a cooling fan.
An ability to externally control volume through serial communication.

5. Block Diagram

6. Component Selection Rational
Microcontroller - Atmel 32UC3B164
> 11 GPIO (1 RPG + 6 buttons)
USART (Serial Communication)
2 ADC (2 Temperature Sensors)
3 PWM (2 fans + 1 LED)
Motherboard - Intel Atom D525MW
VGA
2 USB (IR Camera + External Connection)
Aux/RCA Audio
Power - RaidMax RX-380K
~300 W (12V, 5V, 3.3V)
Package - Wooden Box
< 4' in height
32"x24" screen
Cheap
Mobile

7. Packaging Design Considerations
Mobile
Lightweight
Large screen
24"x32" screen
Sleek design
Low housing overhead
Cheap but sturdy
Able to support projector mounted on inside wall
Ability to upgrade
User cheaply swap/add components

8. Outside View

9. Internal View

10. Early Stage Frame Build

11. Product Packaging Specifications

12. Schematic / Theory of Operation

13. Fan Output / Crystal Oscillator
Crystal oscillator provides 12 MHz clock.
Fan speed is controlled by PWM from the microcontroller.
Opto-isolator separates fan control from the rest of the circuit.

14. 5V to 3.3V Conversion Driven by 5V from a molex connector of the PSU.
3.3V output drives the microcontroller.

15. Buttons
Simple SPST buttons used for user input for both the motherboard and the projector.

16. Serial Interface
Serial connection used to communicate with motherboard.
MAX232ECWE to drive the signal over a long wire.

17. Reset / Header Reset circuit derived from manufacturer's data sheet.
All unused input pins are connected to headers allowing easier future use.

18. Microcontroller / JTAG Header
JTAG header allows programming after the microcontroller is secured to the PCB.
Decoupling capacitor values and quantity taken from manufacturer's data sheet.

19. IR LED Control IR LED controlled by PWM from microcontroller.
IR LED mimics a remote control in order to control the projector.

20. PCB Layout Main issue is routing around the microcontroller
Every pin is being used
Datasheet recommends use of ~24 decoupling capacitors
External oscillator needs to be used
Solution
Mount decoupling capacitors on underside
Reassign pins so that similar functions are on the same side of the chip

21. PCB Layout (cont'd) High current and voltage requirements for fans
Huge source of noise
Can possibly damage microcontroller
Solution
Optically isolate the fans from the circuit
Provide larger traces for all of the 12V lines
Provide completely separate power and ground for the fans

22. PCB - Overall

23. PCB - Power

24. PCB - Serial Port

25. PCB - Microcontrolelr

26. PCB - JTAG / Temperature Sensors

27. PCB - Buttons / Fan Control

28. PCB - IR LED Control

29. Software Design / Development Status
Microcontroller
ADC
Temperature Sensors - Proven
PWM
Fan Control - Proven
Projector Signal Control - In progress
GPIO
Projector Control - Not started
SCI
Volume Control - Not started
Debugging - Proven
Motherboard
Touch Interface (Touchlib)
App Programming (SDL)
Main Operating System (Xubuntu 11.10)

30. Project Completion Timeline
Week 9 (Week of Mar. 5)
Get Proof-of-Parts, Schematic and PCB done
Get the LEDs mounted on main structure as well as Vellum tape put on acrylic.
Week 10 (Week of Mar. 12)
Spring Break
Some software development
Week 11 (Week of Mar. 19)
Get internals of our box mounted except for PCB and Motherboard.
Get Touchlib functioning with our project.
Week 12 (Week of Mar. 26 )
Finish programming for microcontroller with fan and projector control as well as input handling.
Have at least 1 simple game finished for our project with some work done with our dashboard software

31. Project Completion Timeline (cont'd)
Week 13 (Week of Apr. 2)
Continued debugging of PCB
Continued software development of dashboard and games
Week 14 (Week of Apr. 9)
Week 15 (Week of Apr. 16)
Have PCB fully debugged and functioning correctly with no further work needed.
Finish Software Development of dashboard and have all games finished.
Mount remaining internals into final product.
Week 16 (Week of Apr. 23)
Prepare for final presentation.

32. ?