关于温度控制系统的位置型PID控制算法，设定温度比当前温度低时，PWM的占空比100，全是高电平，停止加热；设定温度比当前温度高很多时，PWM的占空比100，全是低电平，全速加热。-Temperature control system on the location-based PID control algorithm, set the temperature lower than the current temperature, PWM duty cycle of 100, is high,

将输入的信号进行pid算法，自定义算法系数，获取误差值(The PID algorithm is applied to the input signal, the coefficient of the algorithm is defined, and the error value is obtained.)