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P12414: Bicycle Energy Harvester 2011-2012 Objective: To transform mechanical energy produced by a bicycle to electrical energy with intention to charge a cell phone. Our device is designed to be inexpensive to build and easy to install, maintain and use. Background and Motivation: People in countries with inadequate infrastructure have an unmet need for electricity. Resources for creating and storing power are difficult to obtain. This system provides the energy required for communication, and light as well as for other personal electronics once basic needs are met (i.e. GPS, MP3, etc.). Concept Selection: Initial concepts included harvesting energy via vibration, building a generator with magnets on the spokes, a hub generator and a roller with a motor. Ease of use and adaptability were the main reasons for the final selection, a roller and motor combination. Figure 1: Motor Housing Assembly Figure 2: Electronics Box Assembly Program: Solidworks Total Part Files: 29 Distinct Parts Figure 3: Motor Housing Assembly [CAD] Results & Conclusions: Our device shows promise for a system that can be manufactured and utilized in countries such as Haiti. Operating Conditions: In order to harvest the bicycle’s energy, the device must output a minimum voltage. This voltage will then be transferred to a device to store the energy for later use. Future Recommendations: System optimization can be completed by creating iterations with less parts for mass production. Additional suggestions include a variable energy collection that is user selected and designing for waste energy collection. 12V DC motor GND IN OUT 2 1 3 1 U4 LM340-5 C7 10u C8 10u C9 .1u A-type USB Connector 4 0 Figure 5: Voltage Regulating Circuit Aesthetic Appeal 75% of testers rated the device a [4] or higher on a scale of [1] to [5]. Figure 4: Electronics Box Assembly [CAD] Circuit Discussion: The circuit conditions and regulates the electricity generated by a 12V DC motor. The three capacitors stabilize the non-linear voltage input, while a 5V voltage regulator reduces the voltage to a 5V constant output. The power is supplied to small electronic devices via a standard A-type USB connector. Specification Units Ideal Value Actual Value Met Device Cost $(US) <20 $15.02 √ Range of Bikes Tire size (cm)/(in) 60.671.1(cm)/ 24-28 (in) 60.9668.58(cm)/ 24-27(in) √ Range of Phones % of available phones 90% 90% √ Dust Proof IEC60529 Level 6 6 √ Water Proof IEC60529 Level 4 4 √ Brenda Lisitano ME Dan Tobin ME Aaron Sieczkarek ME Zheng (Flora) Li EE Amina Purak IE Sarah Brownell GUIDE Range of Use Device charges 9 of 10 small electronic devices (Above). Phone screen capture before and after a 30 minute usability test (Below). Acknowledgements- Special thanks to Ms. Sarah Brownell, R Community Bikes, Mr. Gerry Garavuso For more information please visit our website at : https://edge.rit.edu/content/P12414/public/Home