本设计是一种基于单片机控制的简易自动寻迹小车系统，包括小车系统构成软硬件设计方法。小车以AT89C51 为控制核心, 用单片机产生PWM波，控制小车速度。利用红外光电传感器对路面黑色轨迹进行检测,并将路面检测信号反馈给单片机。单片机对采集到的信号予以分析判断,及时控制驱动电机以调整小车转向,从而使小车能够沿着黑色轨迹自动行驶,实现小车自动寻迹的目的-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