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Mountain Bike Rallying SDII Final Presentation
November 25, 2008
Team Members
Frank HollandFirmwarePCB DesignPackaging
Michael VanJava GUI CodingPackaging
Andrew ThigpenJava GUI coding
Firmware RefinementPackaging
Overview• Background• Problem• Solution• Constraints
• Practical• Technical
• Testing• Packaging
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
Goal Time
Current TimeDistance
Battery Indicator
GPS Signal
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.
Battery Life Test
• With typical backlight usage:
• approximately 10 hours
Compatibility TestWindows Vista
Compatibility TestMac OSX Leopard
Compatibility TestUbuntu 7.10
Communication Test• Transferred 180
waypoint course to device
Acknowledgement of received waypoint from device
Console Output: Oscilloscope:
GPS Accuracy Test
Benchmark
Tau Beta Phi 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
System Test
• Downloaded event data
System Test
Timing Accuracy Test
• Used an external source
• Compared the times
Packaging - EnclosureEnclosure box w/ 4
AA batteries
Holds all essential components inside and keeps unwanted things outside
Protective boot custom made for the enclosure
Prevents package from breaking
Packaging – Outer Layout
Calipers to measure dimensions
Microsoft Visio to design the layout
Laser cutter to achieve custom fitting holes
PCB Breakdown15 capacitors &
resistors
PSoC microcontroller
EEPROM
Maxim RS232 serial voltage translator
Voltage regulator
Pin Header
Packaging – GPS/PCB
Used insulated hex stand-off
custom cut to fit corner slot of GPS unit
glued to bottom of GPS unit and PCB
Packaging – Inner Layout
LCD glued to top of enclosure
Sits on top of the battery
PCB mounted on top of GPS unit
Shortage clearance
Wiring fits in gap
PackagedSize 4.94 x 2.75 x 1.27"
Weighing in at 13.30 oz
Bill of MaterialsPart Price
PCB $26.40
Capacitors & Resistors $0.83
Integrated Circuits $8.45
LCD $10.51
GPS unit & antenna $84.99
Enclosure & Boot $9.68
Miscellaneous – Transistor/Button/DIP/Header
$4.22
Total $145.32
Questions?