The design is based on simple microprocessor controlled automatic tracing car system, including car system constitutes the hardware and software design methods. Car AT89C51 as the control core microcontroller PWM wave to control the car speed. The use of infrared photoelectric sensor to detect the black track on the road, and road detection signal is fed to the microcontroller. Microcontroller to be the acquisition of signal analysis and judgment, and timely control of the drive motor to adjust the steering of the car, so that the car is traveling along the black track to achieve the purpose of car automatic tracing

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