1. Bike Buddy Group 15Sponsored by Ari Nacius Nowook Park Ethan Pemble Nick Quinlan School of Electrical Engineering & Computer Science

2. 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

3. 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 PM 67 °F Lat: 28.60265 NE 6.73 MPH Lon: -81.23185 Generating 3.7 Watts

4. 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

5. Power Flow Diagram AC generator DC converter Battery charger 6v regulator5v regulator3.3v regulator LCDTemp sensorµCGPS Battery switcher USB Pedal the bike Power System Display System Li- Ion

6. Power Design Review Peripheral Operating Voltage Maximum Current Power Requirement uController3.3v19 mA62.7 mW LCD6v220 mA1320 mW GPS3.3v70 mA231 mW Temp sensor5v1 mA5 mW USB port5v500 mA2500 mW Total Power4.12 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 Battery Capacity1400 mAh Voltage7.4 V (8.4 V peak) Max charge current1 C or 1.4 A Max current draw0.87 A Weight2.5 oz

7. 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

8. Thank you! Bike Buddy Group 15Sponsored by Ari Nacius Nowook Park Ethan Pemble Nick Quinlan