用AT89c51单片机写的一个红外循迹，超声波避障的小车程序。-AT89c51 microcontroller write an infrared tracking car, ultrasonic obstacle avoidance program.

利用C进行的循迹避障小车的程序，小车沿着黑线跑，达到终点可以自动停止，并显示所跑完的时间。-Tracking using C car obstacle avoidance program, the car ran along the black line to reach the end point can be automatically stopped, and the finish time.

有步进电机前进、后退、循迹、避障等程序，以及步进电机小车的接线图-There stepper motor forward, backward, tracking, obstacle avoidance and other procedures, as well as the wiring diagram of the stepper motor car