通过温度采集，通过AD转换，将模拟信号转换为数字信号，经过滤波放大等过程，通过单片机处理，当温度超过或低于规定值是，输出报警信号，报警灯点亮，用数码管输出此时的温度值-By temperature acquisition, through the AD conversion, the analog signal into digital signal, after amplification processes such as filtering, through the microcontroller processing, when the temperature is above or below the specified value, the output alarm signal, alarm lamp lit, with digital output for this when the temperature