mountain bike rallying sdii mid-term presentation september 30, 2008
TRANSCRIPT
Mountain Bike Rallying SDII Mid-Term Presentation
September 30, 2008
Team Members
Frank HollandFirmwarePCB DesignPackaging
Michael VanJava GUI CodingPackaging
Andrew ThigpenJava GUI coding
Firmware RefinementPackaging
Overview• Background• Problem• Solution• Constraints
• Practical• Technical
• Refinements• Packaging• Testing
Background
• Car Rally
• Geocaching
Problem
• Bike rider needs a navigator
• Current GPS units are not suitable for this sport
Solution
Practical ConstraintSustainability
• Ruggedness
• Must be able to withstand a drop from 3 feet
Practical ConstraintEnvironmental
• Operating Conditions
• Must be water resistant
• Must withstand temperatures from -20° to 43°C (-4° to 110°F)
Technical Constraints
• Tracking Accuracy
• The GPS must have an accuracy of 5 meters or less.
• Battery Life
• The overall product must have at least 6 hours of continuous battery life.
Technical Constraints• Display Size
• The display size must be able to hold a minimum of 74 characters on the screen.
• Example:
Current GPS
Next GPS
Current Time
Goal Time
Distance
Technical Constraints
• Product Size
• The product size must 3” x 6” x 3” or less.
• Product Weight
• The overall product must be less than 2 lbs.
Progress• End of Spring Semester
• Very simple device
• One mode of operation once turned on
• Limited display of information
Progress• Currently
• Graphics
• Menu-based operation
• Variable width characters for more information on the screen
Progress• Two modes of operation
• Transfer Mode
• Race Mode
• GPS Status Icon
• Battery Level Icon
Progress• Helpful dialogs to better inform user
• Labels provide more information about waypoints
• Time flashes to indicate goal approaching
Progress• I2C EEPROM
• Transfer up to 10 courses
• GPS data is saved for entire course
Progress
Map of Recorded GPS Data
Schematic
PCB Layout
Packaging• Plastic enclosure
• Built-in 4AA holder
• Available protective “boot” for increased ruggedness
• Fits size constraint
• 4.94 x 2.75 x 0.94"
Tests
•Battery life with backlight
•Size meeting with product specification
•Compatibility across different platforms
Battery Life Test
•Without LCD backlight
• approximately 10 hours
•With LCD backlight
• approximately 8 hours
Size Test
•Size of Enclosure
Compatibility TestWindows Vista
Compatibility TestMac OSX Leopard
Compatibility TestUbuntu 7.10
Results
Tests Results
Battery life with backlight Pass
Size compared to product specification
Pass
Software Compatibility Pass
More Tests
•Communication between device and computer
•System custom course
•GPS accuracy
Communication Test
• Transferred 180 waypoint course to device
Acknowledgement of received waypoint from device
Console Output: Oscilloscope:
System Test
• Downloaded event data
GPS Accuracy Test
•Benchmark
•Tau Beta Pi Monument
•Actual Coordinate
• N 33 27.260 W 088 47.320
•Measured Coordinate
• N 33 27.2596 W 088 47.3201
•Difference
• 0.7590 meters
More Results
Tests Results
Communication Pass
System Pass
GPS Accuracy Pass
Internal Test•Clock
•Signal Strength
Physical Test
•Weight
•Ruggedness
•Water resistance
Questions?