这是一个简单的温度高低报警器，可以设置温度上限和温度下限，一旦温度满足设定条件，蜂鸣器就会发出声音进行报警。内带PROTUES仿真，可直接查看效果。-This is a simple and low temperature alarm, you can set the temperature of the upper and lower temperature limit, the buzzer will sound the alarm once the temperature to meet