Creative practice based on Freescale processor smart car with photoelectric sensor

This paper presents the design of a smart car system based on the Freescale MC9S12SX128 processor. Infrared photoelectric sensor was used to percept the path information. The motor driving system was designed with the MOSFET circuit and controlled by the PID algorithm. With the speed feedback module and steering gear module, the smart car can run along the track steadily and rapidly.