In this paper, the authors illustrate a notable application using a microcontroller 8051. This application proposes to a new and unique technique to regulate wireless car with the help of GUI. Presently, a wireless car can be control by four different sections; the first controlling section deals with sending of some control signal, which based on input provided by the user by Visual Basic (VB) tool and then processing section, process on control signal using CMOS to TTL Converter (HIN232CPO531BC8GIC) and the output of this IC act as a input to microcontroller 8051.