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Digital Tire Pressure Gauge Depressure Inc. Senior Design 4512-01 Team Members Advisor: Dr. Yul Chu Members: Matt Pickney (Team Leader) Nathan Lott Jason Parnell Matt Sampley Abstract

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digital tire pressure gauge

Digital Tire Pressure Gauge

Depressure Inc.

Senior Design 4512-01

slide2

Team Members

Advisor:

Dr. Yul Chu

Members:

Matt Pickney

(Team Leader)

Nathan Lott

Jason Parnell

Matt Sampley

abstract
Abstract
  • Our team will design a tire pressure gauge designed to compete with the more affordable models currently on the market, in terms of both price and gauge accuracy.
  • Primary challenges of the project:
    • Sensitivity
    • Accuracy
    • Keeping prototype cost low
current low end market digital tire pressure gauges
Current Low-End Market Digital Tire Pressure Gauges

- Monkey Grip

- Accu-gage

- Victor

- Cost of each is approx $10

specs for current gauges
Specs for Current Gauges

psi = Pounds per Square Inch

objectives
Objectives

Design a reliable tire pressure gauge that

  • gives accurate readings (within .5 psi)
  • is consistent with its results
  • is easy to use
  • stands up to normal wear and tear
  • is weather resistant
  • consumes relatively little power
  • is low cost
advantages
Advantages
  • Proper tire pressure:
    • Improves fuel mileage
    • Increases the life of the tire
    • Prevents dangerous conditions
  • Properly inflated tires promote optimal:
    • Braking
    • Steering
    • Traction
pressure sensor
Pressure Sensor
  • ICSensors Model 1451
  • +/- .25% error
  • Sensor output: 0-60 mV
  • The output voltage will depend on the pressure received.
microcontroller
Microcontroller
  • Motorola MC68HC908GR8
  • Built-in 8-bit A/D converter
  • 4K FLASH memory
  • 8 MHz bus speed
lcd screen
LCD Screen
  • Luminex Inc. Model LCD-S301C31TR
  • Three digit display
  • Will show 0-99 psi in .5 psi increments
power supply
Power Supply
  • Lithium Coin Style
  • 3V
  • 620 mAH
future work
Future Work
  • Software development (gauge calibration, sensitivity tweaking)
  • Power efficiency adjustments
  • Further cost reduction
  • Packaging
summary
Summary
  • Our gauge will be accurate, easy to use, and affordable.
  • It will be built to outperform other low-cost gauges.
  • The gauge will have a lifespan competitive with any other gauge on the market.
acknowledgements
Acknowledgements

Thanks to:

Dr. Yul Chu

Kristen Roberts

references
References
  • [1] Roadgear.com, [Online]. Available: http://www.roadgear.com/catalog/detail.cfm?Prod_ID=49
  • [2] M68HC08 Microcontrollers [Online], Available: http://rocky.digikey.com/WebLib/Motorola/Web%20Data/MC68HC908GR8.pdf
  • [3] ICSensors Model 1451, [Online] Available: http://rocky.digikey.com/WebLib/Measurement%20Specialties%20Inc/Web%20Data/Model%201451.pdf
  • [4] Luminex Model LCD-S301C31TR, [Online], Available: http://rocky.digikey.com/WebLib/Lumex/Web%20Data/lcd-s301c31tr.pdf
  • [5] Malik, D., High Accuracy Digital Tire Pressure Gauge, [Online], Available: http://e-www.motorola.com/files/sensors/doc/app_note/AN1953.pdf