说明：  该代码是基于80C51单片机单片机编写，可以实现小车的左转，右转等，前进和后退，在遇到金属时能够自己停止，从而可以实现循迹功能。
(The code is written based on the 80C51 single-chip microcontroller, can realize the car turn left, turn right, forward and backward, can stop in the face of metal, which can achieve the tracking function.)