Development of Ultrasonic Small Flow Measuring Instrument Based on STC89C52

The system uses STC89C52 single-chip microcomputer as the core control chip to realize the function of measuring small flow by ultrasonic, combined with the minimum system of single-chip microcomputer, liquid crystal display, ultrasonic measuring displacement module, button module and buzzer alarm circuit. The liquid crystal display of the meter displays functions such as instantaneous flow rate, instantaneous flow rate, and flow rate over-limit alarm. At the same time, the H of the liquid level change height difference value, the T of the liquid level height difference change time and the S of the button setting container bottom area value are displayed. Though a simple and intelligent operation process, the design accurately and quickly obtains traffic data information, which not only greatly improves the working efficiency of detecting traffic but also reduces the working intensity.