AT89S52 单片机做CPU处理器处理控制，使用 DS18B20 集成温度传感器采集温度数据，七段数码管做显示，可以显示当前的温度值，并且可以设定一个上限温度值并保存在 DS18B20 中，可以调节所要限定的温度值。还设计了一路继电器控制，超出设定温度时继电器被驱动吸合，外电路中的降温风扇开始工作并发出警报，温度低于设定温度后，继电器自动断开风扇停止工作，警报解除。-AT89S52 Single-chip processor to do deal with CPU control, the use of integrated temperature sensor DS18B20 collecting temperature data, Seven-Segment LED display to do, you can display the current temperature value, and can set an upper limit temperature and stored in DS18B20, we can adjust to limit the temperature value. Also designed all the way relay control, beyond the set temperature when the relay was driven pull-in and outside of the cooling fan circuit to start work and sound the alarm, temperature below the set temperature, the relay automatically disconnect the fan to stop working, the alarm lifting.