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