GY-63_MS5611/libraries/AnalogPin/AnalogPin.h

#pragma once
//
//    FILE: AnalogPin.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.2.5
//    DATE: 2013-09-09
// PURPOSE: wrapper for analogRead with smoothing and noise filtering
//     URL: https://github.com/RobTillaart/AnalogPin
//


#include "Arduino.h"

#define ANALOGPIN_LIB_VERSION       (F("0.2.5"))


class AnalogPin
{
public:

  explicit AnalogPin(const uint8_t pin);

  // prescale = { 2..7 }, imho 2 is bad, 3 is pretty noisy, 4 and 5 are acceptable, 6 and 7 are good. Depends on project!!!
  // time indication per analogRead for different prescale values on UNO
  // 2 => 14 uSec     5 => 38 uSec
  // 3 => 18 uSec     6 => 63 uSec
  // 4 => 24 uSec     7 => 120 uSec (default/normal)
  void    setPrescaler(const uint8_t prescale = 7);
  inline uint8_t getPrescaler(void) const { return _prescale; };

  // noise 0..255; in practice only small values are used (0..10).
  inline void    setNoiseThreshold(const uint8_t noise = 0) { _noise = noise; };
  inline uint8_t getNoiseThreshold(void) const { return _noise; };
    
  // alpha 0..31;
  void    setSmoothWeight(const uint8_t alpha = 0);
  inline uint8_t getSmoothWeight(void) const { return _alpha; };

  // set twice to true to do analogRead twice to reduce noise too
  int     read(const bool twice = false);
  int     readSmoothed();

  // expose internal data as that might be useful.
  inline int readPrevious(void) const { return _prevValue; }   
  inline int readLast(void) const { return _value; }


private:
  void    _rawRead();

  uint8_t _pin;
  uint8_t _alpha;
  uint8_t _noise;
  uint8_t _prescale;
  int     _value;
  int     _prevValue;
};

// -- END OF FILE --