Mountain Bike Rallying SDII Mid-Term Presentation September 30, 2008

Team Members Frank Holland Firmware PCB Design Packaging Michael Van Java GUI Coding Packaging Andrew Thigpen Java GUI coding Firmware Refinement Packaging

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 Constraint Sustainability Ruggedness Must be able to withstand a drop from 3 feet

Practical Constraint Environmental 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 Test Windows Vista

Compatibility Test Mac OSX Leopard

Compatibility Test Ubuntu 7.10

Results TestsResults Battery life with backlight Pass Size compared to product specification Pass Software CompatibilityPass

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 W Measured Coordinate N W Difference meters

More Results TestsResults CommunicationPass SystemPass GPS AccuracyPass

Internal Test Clock Signal Strength

Physical Test Weight Ruggedness Water resistance

Questions?