Bike Buddy Group 15Sponsored by Ari 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 PM 67 °F Lat: NE 6.73 MPH Lon: 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 regulator5v regulator3.3v regulator LCDTemp sensorµCGPS Battery switcher USB Pedal the bike Power System Display System Li- Ion

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 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

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 15Sponsored by Ari Nacius Nowook Park Ethan Pemble Nick Quinlan