1. Critical Design Review CPSC 483 – Computer System Design Coff-e-mail Critical Design Review March 10, 2004 Don McGee Eric Peden Payton Quackenbush Zack Roman

2. Critical Design Review Review of Problem Needs Department wants convenient way to keep tabs on the coffee pot. Department wants easy way to remotely check level of coffee in the pot.

3. Critical Design Review Review of Problem Goals and Objectives Goals –Design a complete embedded network system –Build complex analog-digital interfaces (advanced sensors, web cam) Objectives –Unobtrusive footprint –Current coffee status –Statistics and mug shots –Remote notification

4. Critical Design Review Design Snap TiltKit microcontroller – server FPGA, CMUcam – image processing PIC, A/D converter – sensor processing

5. Critical Design Review System Block Diagram

6. Critical Design Review Server User interface to coffee machine Event notifications Statistics Mug shots

7. Critical Design Review Server (cont.) Completed tasks –Software architecture –50% of Java code written Remaining tasks –Approve network access –Remaining code

8. Critical Design Review Server (cont.) Testing procedures –Unit tests –Command-line event simulator –Load tolerance

9. Critical Design Review Sensors PIC polls sensors for data Processes signal data for use by server Controls camera module and passes compressed images to server Controls output of LCD

10. Critical Design Review Sensors (cont.) Completed tasks –Validated sensor data –I/O Protocols / LCD Interface –Pinouts Remaining tasks –Breadboard prototype –Sensor mounting –Programming

11. Critical Design Review Sensors (cont.) Testing procedures –Verify sensor values from LCD –Basic I/O to server to verify serial protocol Data verification will be done server-side

12. Critical Design Review Camera Separate camera module needed –PIC too slow for JPEG compression –Standalone module alleviates synchronization issues Design revision: FPGA for camera input/image processing

13. Critical Design Review Camera (cont.) Completed tasks –Camera output protocol –Camera color spaces –Sample JPEG compression implementation Remaining tasks –Modify JPEG code –Select FPGA –Camera  Sensor module protocol

14. Critical Design Review Camera (cont.) Test procedures –Test camera output with small image window and LCD Cover camera with solid color cards –Software simulation of FPGA Input pre-built RAW image data Output JPEG data to file

15. Critical Design Review Parts List ItemDescriptionCost SNAP TiltKitJava-based microcontroller with on-board 10/100BaseT ethernet $167.00 CMUcamWeb cam$55.00 Jameco 176882PIC 16F877 Microcontroller$9.49 Jameco 10188ADC0809 (Analog to Digital Converter)$2.95 FPGAXilinx XC2S200E FPGA$35.00 LCD20 x 4 character-based LCD for debugging and system status $33.00 Jameco 150551Flex resistor (Quantity: 2)$25.90 RadioShack 276-142Infra-red LED/photo-transistors (Quantity: 5)$14.95 Shipping$60.00 Total$403.29

16. Critical Design Review Conclusion Questions?