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Digital Tire Pressure Gauge

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

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  1. Digital Tire Pressure Gauge Depressure Inc. Senior Design 4512-01

  2. Team Members Advisor: Dr. Yul Chu Members: Matt Pickney (Team Leader) Nathan Lott Jason Parnell Matt Sampley

  3. 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

  4. Current Low-End Market Digital Tire Pressure Gauges - Monkey Grip - Accu-gage - Victor - Cost of each is approx $10

  5. Specs for Current Gauges psi = Pounds per Square Inch

  6. Technical Design Constraints

  7. Practical Design Constraints

  8. 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

  9. Advantages • Proper tire pressure: • Improves fuel mileage • Increases the life of the tire • Prevents dangerous conditions • Properly inflated tires promote optimal: • Braking • Steering • Traction

  10. Physical Model

  11. System Concept

  12. Pressure Sensor • ICSensors Model 1451 • +/- .25% error • Sensor output: 0-60 mV • The output voltage will depend on the pressure received.

  13. Schematic: Pressure Sensor PressureSensor

  14. Microcontroller • Motorola MC68HC908GR8 • Built-in 8-bit A/D converter • 4K FLASH memory • 8 MHz bus speed

  15. Schematic: Microcontroller Microcontroller

  16. LCD Screen • Luminex Inc. Model LCD-S301C31TR • Three digit display • Will show 0-99 psi in .5 psi increments

  17. Schematic: LCD Screen LCDScreen

  18. Power Supply • Lithium Coin Style • 3V • 620 mAH

  19. Schematic: Power Supply Power Supply

  20. Cost Breakdown

  21. Project Breakdown

  22. Future Work • Software development (gauge calibration, sensitivity tweaking) • Power efficiency adjustments • Further cost reduction • Packaging

  23. 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.

  24. Acknowledgements Thanks to: Dr. Yul Chu Kristen Roberts

  25. Questions?

  26. 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

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