team 8 : batteries not included

Team 8 : Batteries Not Included

Dave DickinsheetsMatt Scholten

David QuKnoa 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 Generation

3 Volts at ~25 mph

6 Volts at ~60 mph

4.5 Volts at ~42 mph

7.5 Volts at ~75 mphAll voltages are half wave heightsAll 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?