1. ECE 477 Design Review Team 2  Spring 2010 Digi-Brush Josh LongCaleb Ayew-ewKatie Schremser

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 Child’s toy that can eliminate the mess and stress of children painting. User can use multiple colors by mixing 8 given colors Current color will be indicated through an LED in the tip of the brush Painting will be recognized by interaction with a 15” touch screen Image on the display can be saved onto an SD Card

4. Project-Specific Success Criteria 1.An ability to display images on the display board 2.An ability to track the digital brush on the display board 3.An ability to mimic paintbrush stroke characteristics on the display board 4.An ability to save the painted image on a SD card 5.An ability to distinguish user’s color selection and display selected color before being painted

5. Block Diagram

6. Microcontroller : Freescale 9S12DP512DGV1 16-bit CPU (HCS12) 512 kB Flash EEPROM (Program Memory) Multiple Peripherals – 3 SPI (FPGA) – 2 8-channel, 10-bit ATD (Color pots, Touch Screen, Force Resistor) – 1 IIC (LED Driver) Max Frequency of 50 MHz (with external oscillator) 5V Operation

7. FPGA: Cyclone II EP2C20Q240C8 K ABB9Y0737A 4 PLLs 239,616 total RAM bits 26 Embedded Multipliers 3.3V, Max 260 MHz Operation Easily Accessible VHDL Libraries Low Cost

8. 15” Touch Monitor/Touch Screen 15” Size – Comparable to an 8.5” x 11” piece of paper – Cheaper than 12.1” for both parts combined 15” Touch Monitor – Separate Monitor and Touch Screen were cheaper than a pre-packaged touch screen 15” 5-Wire Resistive Touch Screen – Resistive technology allows recognition by items other than fingers – 5-Wire allows more accuracy than 4-Wire

9. Packaging Design 8 Color pots 1 “Water” Pot 15” LCD Monitor 15” Touch Screen Save/Clear Buttons Brush Holder/Connector

10. Theory of Operation Power Microcontroller – LED Driver – Color Pots – Force Resistor – Touch Panel FPGA – Boot Chip – SDRAM – VDAC/Monitor – SD Card Reader

11. Theory of Operation: Power 31V @ 2.4A inputs to linear regulators from a wall-wart Three LM350 Linear Regulators – >=28V to: 1.25V 3.3V 5V

12. Theory of Operation: Power Schematic

13. Theory of Operation: Microcontroller External DeviceProtocol (No. Pins) FPGASPI (4) GPIO (4) Color PotsATD (1 each * 9 = 9) Force ResistorATD (1) LED DriverIIC (2) Touch ScreenATD (1) GPIO (4) 50 MHz External Oscillator 2 GPIO for Save and Clear Screen Pushbuttons 5V V dd

14. Theory of Operation: Microcontroller Schematic

15. LED Driver

16. Theory of Operation: FPGA 50 MHz External Oscillator 133 MHz External Oscillator 1.25V Internal 3.3V V dd – Level Translator between FPGA and Microcontroller External DeviceProtocol (No. Pins) MicrocontrollerSPI (4) GPIO (4) SD Card ReaderSPI (4) VDACParallel Bus (33) SDRAMData Bus (16) I/O (24) Boot ChipDigital I/O (5)

17. Theory of Operation: FPGA Schematic

18. VDAC, Boot Chip, Level Translator

19. SDRAM

20. PCB Layout: Considerations Separation of Analog and Digital Large Traces for Power and GND – Copper Pour for GND Many Decoupling Capacitors Valid Trace Placements Room for Expansion (Headers) if needed

21. PCB Layout: Overall

22. PCB: Power Supply

23. PCB: µC, LED Driver, Oscillator, and Level Translator

24. PCB: FPGA

25. PCB: VDAC, Boot Chip

26. PCB: SDRAM

29. Software Design/Development Status Functional Proof of Concept for mixing colors created using Java Programming Microcontroller with Freescale CodeWarrior and P&E BDM Multilink – Using to simulate interrupts and simple programs relevant to the project Have access to SPI, VDAC, and SDRAM VHDL Libraries for the FPGA

30. Project Completion Timeline

31. Questions / Discussion