Efforts to utilize renewable energy can be enhanced by using alternative energy resources, such as motion power, one of which is a simple electricity generator from a stationary bike. The system utilizes pedaling motion, converted by a DC generator into battery charging. In this project, several developments were made, including charging efficiency, monitoring systems, energy accumulation, distance tracking, and a bonus system. The testing shows that the gear ratio affects RPM speed, proven by a rotation of 3000 at gear 5. Using gear 5, the power output at 3100 RPM reached 96.81W, with generator voltage at 21.3V, charging voltage at 14.26V, and current at 6.73A. Energy testing was conducted with four users pedaling for 5 minutes. The first user achieved an energy accumulation of 3.270 Wh, a bonus of Rp. 300, and a distance of 2146m. Test results for all four users are also presented in graph form for comparison. Parameters during the charging process can be monitored through the Arduino-based monitoring system.
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