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52 lines
1.0 KiB
C++
52 lines
1.0 KiB
C++
//
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// FILE: AnalogPin.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.04
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// DATE: 2014-10-05
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// PURPOSE: wrapper class for analogRead
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//
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// HISTORY:
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// 0.1.00 - 2013-09-09 initial version
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// 0.1.01 - 2013-11-09 added some comments
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// 0.1.02 - 2014-10-05 changed signatures datatypes
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// 0.1.03 - 2014-12-07 some refactor
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// 0.1.04 - 2015-03-06 refactor smaller footprint
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//
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// Released to the public domain
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//
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#include "AnalogPin.h"
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AnalogPin::AnalogPin(const uint8_t pin)
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{
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_pin = pin;
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_prevValue = analogRead(pin);
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}
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int AnalogPin::read(const uint8_t noise)
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{
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int value = analogRead(_pin);
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if (noise == 0 || ((value - _prevValue) & 0x7FFF) > noise)
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{
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_prevValue = value;
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}
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return _prevValue;
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}
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int AnalogPin::readSmoothed(uint8_t alpha)
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{
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if (alpha > 31) alpha = 31;
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int value = analogRead(_pin);
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if (alpha > 0)
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{
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value = value + (alpha * (_prevValue - value)) / 32;
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}
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_prevValue = value;
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return value;
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}
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int AnalogPin::readPrevious()
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{
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return _prevValue;
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}
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// -- END OF FILE --
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