Transcript CPSC 483 – Computer System Design

CPSC 483 – Computer
System Design
Coff-e-mail 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
Item
Description
SNAP TiltKit
Java-based microcontroller with on-board
10/100BaseT ethernet
CMUcam
Web cam
Jameco 176882
PIC 16F877 Microcontroller
$9.49
Jameco 10188
ADC0809 (Analog to Digital Converter)
$2.95
FPGA
Xilinx XC2S200E FPGA
$35.00
LCD
20 x 4 character-based LCD for debugging and
system status
$33.00
Jameco 150551
Flex resistor (Quantity: 2)
$25.90
RadioShack 276-142
Infra-red LED/photo-transistors (Quantity: 5)
$14.95
Critical Design Review
Cost
$167.00
$55.00
Shipping
$60.00
Total
$403.29
Conclusion
Questions?
Critical Design Review