Tyler Belle(tb356)

Supervisors : Dr Gianluca Marcelli

Mr. Steve Kelly

• Project Background• Introduction

• Aims & Objectives

• Deliverables

• Functional Specification• Technical Requirements

• Methodology

• Gantt Chart & Project Plan

Energy harvesting is the process employed to repurpose external energy for use in powering small appliances.

• Green Technology global push( wind, solar… now motion)

• Portable power for portable devices

• Eliminate need for bulky batteries for everyday and special consumers

Design and implementation of a wearable energy harvester which converts kinetic energy to electrical energy for use for purposes such as powering small electronics.

• Create a circuit which transforms kinetic energy to electrical energy by employing Faraday’s law of induction

• Device will charge small electronics via a suitable interface(USB)

• Enclose circuit in a box which is strapped to users arm• Implementation of LED user feedback for charge level

• Kinetic Energy Harvesting Circuit

• Enclosure and Rigging Mechanics for Circuit to ensure wearability of device

• Kinetic to Electrical Energy Conversion

• Electrical Energy Storage

• Charging of small electronics

• Additional LED Feedback

• Housing of circuit in wearable enclosure

9 V battery

USER MOVEMENT INDUCTION VOLTAGE REGULATION

LITHIUM POLYMER CELL

LED VOLTAGE INDICATOR FEEDBACK

VOLTAGE REGULATION

Main Circuit

LED Voltage

Indicator Circuit

• Employment of Faraday & Lenz’ law of induction

• Change in magnetic environment of a coil will cause voltage induction

• No matter how the change is produced, the voltage will be generated

• Lithium Polymer Battery Cell

• Small, lightweight and powerful

• Requires safety rigging from damage

• Charge via USB port

• Widely used convention for small electronics

• Possible problem : User unaware of amount of charge on device at any given time

• Range adapted for Lithium Polymer Battery ( 3.7(Discharge) –4.2(Fully Charged))

• Wrist movement causes voltage induction

• Induced voltage stored in battery cell

• Switch available to enable voltage LED indication

• Battery discharges when USB compatible circuit closes

• Entire Enclosure secured by straps

Main PCB

Inductors with magnets

Inner Enclosurefor LiPo

Battery HolderFor LED Voltage

Indicator

USB

• Research• Presentation• Component Ordering• Testing of Individual Components• Design of PCB• Interim Report• Soldering components• Enclosure Prototype• Testing of final circuit• Ordering(if necessary) final enclosure based on circuit dimensions• Mechanical Assembly• Final Report• Poster Design

COMPONENT BUDGET

Magnets (Pack of 3) x 2 ₤10.05

Bridge Rectifier ₤0.23

+5 Voltage Regulator ₤0.25

Adjustable Voltage Regulator ₤0.37

Li-Po Cell ₤7.80

Switch ₤1.37

USB Socket ₤0.34

LM3914 IC ( LED Voltage Indicator) ₤2.52

Potting Box for Lithium Polymer Cell ₤1.34

9 Volt Battery ₤2.53

9 Volt Battery holder ₤0.29

9 Volt Adjustable voltage regulator ₤1.46

Insulating Pipe ₤1.59

Pipe End x 2 ₤1.49

Enclosure (Averaged) ₤7.00

TOTAL ₤38.63