This paper describes about the development of optimized design of a windmill prototype, using'c' language. The wind turbine generator developed based on this design is used to generate electrical energy as the output from the atmospheric wind. The wind energy available from atmospheric wind flowing between the blades of prototype wind millis converted into mechanical energy. This mechanical energy is used to run a stepper motor. This Stepper motor, which acts like a generator converts mechanical energy into electrical energy. This Electrical energy is regulated using an electronic circuit. The regulated Direct Current can either be stored in a rechargeable battery or can be used directly to charge the cell phones. © 2017 Elsevier B.V., All rights reserved.