以at89s52为微控制器，利用PID控制算法对水温进行恒温控制，使水温保持在设定值，并实时显示当前水温和偏差。-AT89s52 is used as the microcontroller ,PID control algorithm is designed to control the water temperature and make water temperature maintain the set value .And system can display the curren

制作一个简易的恒温控制器学习PID。 使用到ds18b20 5V加热器（TB有卖） 场效应管IRF 640N用于开通和关断加热器。 设置预设值，通过PID不断矫正加热器输出，达到预设温度(we made a simple pid controler based on 51 in order to learn pid theory.they can control temperature to get a stable figure.)