利用AT89C51 单片机为核心，配合温度传感器，信号处理电路，显示电路， 输出控制电路等组成的控制系统，并使用PID控制算法来实现水温温度的控制- using AT89C51 microcontroller as the core, with the temperature sensor, signal processing circuit, display circuit, the output control circuit and other components of control systems, and use the PID control algorithm to achieve the control of water temperature