三路循迹小车的循迹，其中包括了超声波雷达测距，步进电机工作以方便雷达对左右两侧物体测距后显示在1602上，其中为了方便使用这里对程序分列和合并在一起。基于89c52芯片-Three-way tracking car tracking, including ultrasonic radar range, in order to facilitate the work of the stepping motor to the left and right sides of the object radar ranging in 1602 after the show, which, in order to facilitate the use of this program disaggregated and combined . Based 89c52 chip