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Published byMagdalene Hancock Modified over 8 years ago
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Mountain Bike Rallying SDII Mid-Term Presentation September 30, 2008
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Team Members Frank Holland Firmware PCB Design Packaging Michael Van Java GUI Coding Packaging Andrew Thigpen Java GUI coding Firmware Refinement Packaging
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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 Constraint Sustainability Ruggedness Must be able to withstand a drop from 3 feet
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Practical Constraint Environmental 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 Test Windows Vista
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Compatibility Test Mac OSX Leopard
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Compatibility Test Ubuntu 7.10
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Results TestsResults Battery life with backlight Pass Size compared to product specification Pass Software CompatibilityPass
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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 TestsResults CommunicationPass SystemPass GPS AccuracyPass
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Internal Test Clock Signal Strength
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Physical Test Weight Ruggedness Water resistance
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Questions?
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