Team 8 : Batteries Not Included

Dave Dickinsheets

Matt Scholten

David Qu

Knoa Knapper

Presentation Outline

Project Re-introduction

Design Process

Major Obstacles

Major Accomplishments

Next Steps

Battery-free Tire Pressure Monitoring System

Project Re-Introduction

Design Process

Utilized feasibility calculations/physics resources Number of wraps on coil Coil diameter Magnet Orientation

Tested theories on test apparatus Adjusted design accordingly

Major Obstacles Magnet Orientation

Proper orientation gives higher voltage Proper orientation reduces the number of

magnets necessary Coil Design/Manufacturing

Compact coils Working coils

Mounting

Major Accomplishments

Working test apparatus

Major Accomplishments

Magnet Mounting Bracket Design

Caliper

Magnet

ThreadedHeightAdjustment

Caliper Mounting Holes

Major Accomplishments

Voltage Generation3 Volts at ~25 mph

6 Volts at ~60 mph

4.5 Volts at ~42 mph

7.5 Volts at ~75 mph

All voltages are half wave heights

All speeds are simulated on test apparatus without a tire mounted

Readings taken at 5 V/division on Y-axis 5 ms/division on X-axis

Major Accomplishments

Circuit Design Tested Half Wave Rectifier Requires Voltage Regulator

Magnet Orientation Coil Design Improved Purchased TPMS System Budget Under Control

Next Steps

Refine magnet and coil size Refine circuit design Mounting design for coil and circuit Magnet bracket construction Develop TPMS testing method

Questions?