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

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.

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

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

Critical Design Review System Block Diagram

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

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

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

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

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

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

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

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

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

Critical Design Review Parts List ItemDescriptionCost SNAP TiltKitJava-based microcontroller with on-board 10/100BaseT ethernet $ CMUcamWeb cam$55.00 Jameco PIC 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 Flex resistor (Quantity: 2)$25.90 RadioShack Infra-red LED/photo-transistors (Quantity: 5)$14.95 Shipping$60.00 Total$403.29

Critical Design Review Conclusion Questions?