M5Stack/examples/Modules/BALA2/pid.h

#ifndef _PID_H_
#define _PID_H_

#include "Arduino.h"

class PID {
   public:
    // commonly used functions
    // **************************************************************************
    PID(float point, float kp, float ki, float kd);

    float Update(float input);
    void SetOutputLimits(float max_out, float min_out);
    void SetIntegralLimits(float max_out, float min_out);
    void SetPoint(float point);
    void SetDirection(int8_t dir);
    void UpdateParam(float kp, float ki, float kd);
    void SetIntegral(float integral);
    void SetIntegralOffset(float offset);

    float error_integral;

   private:
    float _kp, _ki, _kd;
    float _point;
    float error_integral_offset;
    float input_last;
    float error;
    float output_max, output_min;
    float integral_max, integral_min;
    int8_t _dir;
};

#endif