Mountain Bike Rallying SDII Final Presentation November 25, 2008

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?