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58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
#pragma once
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//
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// FILE: AnalogPin.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.3
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// DATE: 2013-09-09
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// PURPOSE: wrapper for analogRead with smoothing and noise filtering
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// URL: https://github.com/RobTillaart/AnalogPin
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//
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#include "Arduino.h"
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#define ANALOGPIN_LIB_VERSION "0.2.3"
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class AnalogPin
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{
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public:
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explicit AnalogPin(const uint8_t pin);
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// prescale = { 2..7 }, imho 2 is bad, 3 is pretty noisy, 4 and 5 are acceptable, 6 and 7 are good. Depends on project!!!
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// time indication per analogRead for different prescale values on UNO
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// 2 => 14 uSec 5 => 38 uSec
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// 3 => 18 uSec 6 => 63 uSec
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// 4 => 24 uSec 7 => 120 uSec (default/normal)
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void setPrescaler(const uint8_t prescale = 7) { _prescale = constrain(prescale, 2, 7); };
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inline uint8_t getPrescaler(void) const { return _prescale; };
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// noise 0..255; in practice only small values are used (0..10).
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inline void setNoiseThreshold(const uint8_t noise = 0) { _noise = noise; };
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inline uint8_t getNoiseThreshold(void) const { return _noise; };
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// alpha 0..31;
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void setSmoothWeight(const uint8_t alpha = 0) { _alpha = min(alpha, 31); };
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inline uint8_t getSmoothWeight(void) const { return _alpha; };
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// set twice to true to do analogRead twice to reduce noise too
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int read(const bool twice = false);
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int readSmoothed();
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// expose internal data as that might be useful.
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inline int readPrevious(void) const { return _prevValue; }
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inline int readLast(void) const { return _value; }
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private:
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void rawRead();
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uint8_t _pin;
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uint8_t _alpha;
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uint8_t _noise;
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uint8_t _prescale;
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int _value;
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int _prevValue;
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};
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// -- END OF FILE --
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