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 microcontro