Human energy is a renewable and abundant source. It can be effectively used in DC home electric systems. To convert human energy into electrical energy, a bicycle power generator is required, accompanied by a battery to store the converted energy. Nevertheless, the varying nature of the energy generated through pedaling may lead to swift damage to the battery. The author designed and built a charge controller to ensure a constant flow of voltage and current to the battery. Abbreviations of technical terms are explained the first time they are used. The language is clear, objective, and formal, without filler words or biased language. The writing adheres to conventional structure and uses precise word choice. Grammatical correctness and consistent formatting are employed, with common academic sections included. The Buck Converter topology regulates the field current (If) entering the alternator to maintain a stable alternator output voltage. The current from the source flows into the Buck Converter circuit. The microcontroller adjusts the duty cycle to set the field current (If) in the Buck Converter. When the rotation of the alternator is high, the value of the field current (If) is decreased, and when the rotation is low, the value of the field current (If) is increased in order to maintain a constant output voltage despite the changes in rotation.