Design of ultrasonic distance measuring system with transmitting-receipting sensor

An ultrasonic distance measuring system with a transmitting-receipting sensor is introduced.It consists of transmitting circuit, preamplifier, filter, AGC, shaping circuit and MCU, etc.The preamplifier consists of the audio-frequency power amplifier LM386.Moreover,a method of detecting reflected peak value is used on data collecting and processing good results have been achieved.