一种基于AT89C51单片机的智能温度控制器，采用K型热电偶和专用冷端温度补偿芯片MAX6675构成温度测量电路，由MAX6675输出的数字信号直接送入单片机，一方面通过 LCD 将温度显示出来；另一方面，将该温度与设定的温度值进行比较，根据其偏差的大小，采用改进的数字PID算法对其进行处理得到控制信号，此信号经过D\A转换器DAC0832转换为模拟量输出0～5V。- kind of based on AT89C51 intelligent temperature controller, the K thermocouple and special type of the cold end temperature compensation MAX6675 constitute a temperature measurement circuit chip, MAX6675 output by the digital signal directly into the single chip microcomputer, on the one hand, through the LCD will display temperature　On the other hand, will the temperature and setting value, compared the deviation according to the size of the digital PID algorithm of the improved the processing get control signal, the signal through D \ A converter DAC0832 into analog output 0 ~ 5 V.