摘　要 针对实现液罐的监测与控制系统，采用下位机：以C52单片机为核心，控制HC-SR04超声波测距模块和DS18B20(In order to realize the monitoring and control system of liquid tank, the lower computer is adopted: the C52 single chip microcomputer is the core, and the HC-SR04 ultrasonic ranging module