Abstract: Doctors usually cure patients by intravenous infusion, according to the type of drug and the patient's specific illness, The appropriate infusion rate has a great impact on treatment of disease and patient safety. Based on the MCU MSP430 and the application of photoelectric sensor, a set of liquid drip speed fuzzy PID control system has been designed to set the injection speed of the liquid drip according to the injection speed of different drugs. And automatic control of liquid drip has been achieved through the fuzzy PID controller to control the output of stepper motor, which can reduce the risk of unattended infusion so as to guarantee the safety of all patients.

Key words: Intravenous infusion, dripping speed control, fuzzy PID control, MSP430

摘要： 静脉输液是医生对患者常有的治疗方式，根据药物的种类与患者的具体情况，稳定，适宜的输液速度对疾病治疗效果和患者安全有较大的影响。本次设计以MSP 430单片机为主控单元，应用光电传感器开发了一套液体点滴速度模糊PID控制系统，该系统根据不同药品最佳注射速度来设定液体点滴的注射速度，根据模糊PID控制器输出控制量至步进电机，实现液体滴速的自动控制，从而可以减少无人看护患者输液的事故风险、保障所有患者的安全。

关键词: 静脉输液, 滴速控制, 模糊PID, MSP430