用C8051F020做的关于水温控制系统的一套资料，用到PID算法控制PWM波形来控制加热丝。-C8051F020 do with water temperature control system on a set of data, PID control algorithm is used to control the heating wire PWM waveform.

双容水箱液位控制系统用积分分离法调节实现PID控制-Double let water tank liquid level control system using integral separation PID control