超声波测距和显示 检测障碍物并且显示距离障碍物的距离值-Ultrasonic distance measurement and display obstacle detection and display the distance from the obstacle.

利用红外对管检测黑线与障碍物，并以STC89C52单片机为控制芯片控制电动小汽车的速度及转向，从而实现自动循迹避障的功能-Using Infrared Emitting Diode detection of black lines and obstacles and STC89C52 microcontroller control chip speed and steering control of electric cars, enabling automatic tracking obsta