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In the process of blood transfusion in artificial liver, the liquid level of blood inside the dropper must be monitored in real time to ensure the stability and safety of transfusion. According to the requirement of the liquid level detection, we designed a kind of ultrasonic liquid level sensor based on STM32 and MODBUS protocol. Combined with 40KHz ultrasonic transceiver probes and signal amplification circuits, real-time monitor was implemented by STM32 with its built-in PWM and AD convert modules. The parameters of sensor can be modified by MODBUS commands to adjust the sensitivity, stability and reliability. The sensor had the advantages of simple structure, low cost, high sensitivity. And the experimental results showed that the sensor was applicable to artificial liver systems.

Design of Ultrasonic Liquid Level Sensor Based on STM32 with MODBUS Protocol