本文介绍了一种基于51单片机的小车寻迹系统。该系统采用两组高灵敏度的光电对管，对路面黑色轨迹进行检测，并利用单片机产生PWM波，控制小车速度。测试结果表明，该系统能够平稳跟踪给定的路径。-This article describes a 51 MCU-based car tracking system. The system uses two sets of high sensitivity photoelectric tube, on road black track detection, and the use of single-chip PWM wave to control the car speed. The test results show that the system can have a smooth track the given path.