主要运用超声波换能原理、超声波传感器、超声波测距技术、超声波定位原理和超声波电路接口等超声波相关的理论知识，以及单片机工作原理、接口技术和编程命令及方法等知识，经过比较论证，在诸多方案中选择一种无论从硬件还是从软件上，都可实现性能比较优且实现方法简易的性价比高的超声波测距小系统。该系统硬件部分以单片机控制电路为核心，通过基时电路向外界发射超声波，超声波遇到障碍物向相反方向反弹，超声波接收探头接收到回波，接收电路对接收信号进行放大整形，与单片机进行接口，再通过单片机进行运算，最后在-The main design principles of the use of ultrasonic transducers, ultrasonic sensors, ultrasonic ranging technology, ultrasonic positioning theory and ultrasonic interface circuits, such as ultrasonic relevant theoretical knowledge, And the principle of SCM, interface technology and programming commands and methods of knowledge, the comparison demonstration, in many programmes in a choice of both hardware and software, could achieve excellent performance and relatively simple method of achieving Ultrasonic Ranging bid was high on the system. The system hardware to SCM control circuit as the core, through the circuit at the base to the outside world launched ultrasound, ultrasound encountered obstacles to the rebound in the opposite direction, to receive ultrasound probe to receive Echo, the reception circuit to receive signals Larger plastic, and MCU to interface, and then through the microcontroller for computing, in the final show circuit shown in the results. After the debugging surv