3. 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
4. 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
5. • Kinetic Energy Harvesting Circuit
• Enclosure and Rigging Mechanics for Circuit to
ensure wearability of device
6. • Kinetic to Electrical Energy Conversion
• Electrical Energy Storage
• Charging of small electronics
• Additional LED Feedback
• Housing of circuit in wearable enclosure
10. • 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
11. • Lithium Polymer Battery
Cell
• Small, lightweight and
powerful
• Requires safety rigging
from damage
12. • Charge via USB port
• Widely used convention
for small electronics
13. • 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))
14. • 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 Enclosure
for LiPo
Battery Holder
For LED Voltage
Indicator
USB
15. • 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
16.
17. 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
