Bike Buddy Group 15Sponsored by Ari Nacius Nowook Park Ethan Pemble Nick Quinlan School of...
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Transcript of Bike Buddy Group 15Sponsored by Ari Nacius Nowook Park Ethan Pemble Nick Quinlan School of...
Bike BuddyGroup 15 Sponsored byAri Nacius
Nowook Park
Ethan Pemble
Nick Quinlan
School of Electrical Engineering & Computer Science
Motivation
Bicycle generators on the market today are used only to power headlights.
Our goal is to expand on possible applications of this alternative energy source by providing additional features to the bike rider.
Bicycle headlight
Bike Buddy
Bike Buddy uses a portable AC generator to harness power from pedaling.
This power is stored in a lithium-ion battery and is supplied to the display unit and external USB devices.
Bike Buddy attaches to the bicycle and displays riding information. Speed (mph) and direction Lat./Long. coordinates Ambient temperature Power generated by pedaling
(Watts)
[picture]
12:37 PM67 °F
Lat: 28.60265
NE6.73 MPH
Lon: -81.23185
Generating 3.7 Watts
Goals
To provide the rider’s position and direction using GPS system.
To efficiently power all systems with the AC generator while displaying accurate information to the rider.
To serve as a portable, flexible charging system that can be mounted on any bike.
Bicycle tire-mounted generator
Power Flow Diagram
AC generator
DC converter
Battery charger
6v regulator 5v regulator 3.3v regulator
LCD Temp sensor µC GPS
Battery switcher
USB
Pedal the bikePower
System
Display System
Li-Ion
Li-Ion
Power Design Review
PeripheralOperating Voltage
Maximum Current
Power Requirement
uController 3.3v 19 mA 62.7 mW
LCD 6v 220 mA 1320 mW
GPS 3.3v 70 mA 231 mW
Temp sensor 5v 1 mA 5 mW
USB port 5v 500 mA 2500 mW
Total Power
4.12 W
System Power Requirements
Generator
The generator has a rated output of 6 watts, and produces 10-20 volts AC at a comfortable riding speed.
Battery charger
This is converted to DC and charges one of two Lithium-Ion batteries in roughly 60 minutes.
Battery switcher
When the battery level is nearly depleted at 3.5 volts, it is swapped with the charged battery.
Display system
Bike Buddy can operate for approximately 70 minutes before depleting one of the batteries.
Lithium-Ion BatteryCapacity 1400 mAh
Voltage 7.4 V (8.4 V peak)
Max charge current
1 C or 1.4 A
Max current draw 0.87 A
Weight 2.5 oz
Further Applications
Additional features for Bike Buddy Exercise (tracking calories burned, heart rate)
Implement a security system
Expand GPS capabilities with a map & directions system
Support charging for more kinds of devices
Modify design for indoor use as a household power generator
Thank you!
Bike Buddy
Group 15 Sponsored byAri Nacius
Nowook Park
Ethan Pemble
Nick Quinlan