With the improvement of people's pursuit of quality of life, the development of modern industrial and agricultural technology is also faster and faster. More and more greenhouses appear in people's lives. In the greenhouses, temperature is one of the most important variables. Temperature has a great impact on the growth of plants, so people need to detect and control the temperature of greenhouses when they grow them. In this design, the buzzer is used as the temperature alarm of the electroacoustic element. The temperature alarm has simple structure, strong operability and wide application. When working, the temperature measurement range is 0 to 99.9 ℃, and the accuracy is 0.1 ℃. The load of this design is fan and electric heater. If the current ambient temperature exceeds the set maximum temperature, the buzzer will give an alarm, so that the relay is closed, and the load starts to work. If the temperature exceeds the upper limit, the fan starts to work. If the temperature is lower than the lower limit, the electric heater starts to work.<br>
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