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169 lines
3.5 KiB
C++
169 lines
3.5 KiB
C++
//
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// FILE: TSL260R.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.4
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// DATE: 2022-11-25
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// PURPOSE: library for the TSL260R IR to voltage convertor
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// URL: https://github.com/RobTillaart/TSL260R
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#include "TSL260R.h"
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TSL260R::TSL260R(uint8_t pin, uint16_t maxADC, float voltage)
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{
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_pin = pin;
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_voltagePerStep = voltage / maxADC;
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// datasheet page 9 figure 12
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// irradiance parameters
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_aa = 10.0067;
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_bb = -0.02013423;
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// waveLength parameters
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_waveLength = 940;
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_waveLengthFactor = 1.0;
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}
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TSL260R::TSL260R()
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{
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TSL260R(0, 1, 0); // prevent divide by zero
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// datasheet page 9 figure 12
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// irradiance parameters
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_aa = 10.0067;
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_bb = -0.02013423;
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// waveLength parameters
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_waveLength = 940;
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_waveLengthFactor = 1.0;
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}
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float TSL260R::irradiance(float voltage)
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{
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float value = _aa * voltage + _bb;
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if (_waveLengthFactor != 1.0) value *= _waveLengthFactor;
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return value;
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}
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float TSL260R::irradiance()
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{
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if (_voltagePerStep <= 0) return 0;
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float voltage = analogRead(_pin) * _voltagePerStep;
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return irradiance(voltage);
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}
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void TSL260R::setWaveLength(uint16_t waveLength)
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{
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_waveLength = waveLength;
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_waveLengthFactor = calculateWaveLengthFactor(_waveLength);
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}
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uint16_t TSL260R::getWaveLength()
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{
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return _waveLength;
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}
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float TSL260R::getWaveLengthFactor()
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{
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return _waveLengthFactor;
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}
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float TSL260R::calculateWaveLengthFactor(uint16_t waveLength)
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{
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// figure 12 datasheet
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// 940 nm is reference 1.000
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// remaining is linear interpolated between points in the graph
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float in[] = { 800, 830, 880, 900, 940, 990, 1050, 1100, 1150};
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float out[] = { 0.01, 0.1, 0.8, 1.0, 1.0, 0.5, 0.3, 0.1, 0.01};
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// the correction factor is reciprocate as sensor is less sensitive.
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return 1.0 / multiMap(waveLength, in, out, 9);
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}
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///////////////////////////////////////////////////////
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//
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// irradiance parameters
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//
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void TSL260R::setAA(float aa) { _aa = aa; }
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float TSL260R::getAA() { return _aa; }
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void TSL260R::setBB(float bb) { _bb = bb; }
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float TSL260R::getBB() { return _bb; }
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///////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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float TSL260R::multiMap(float value, float * _in, float * _out, uint8_t size)
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{
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// take care the value is within range
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// value = constrain(value, _in[0], _in[size-1]);
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if (value <= _in[0]) return _out[0];
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if (value >= _in[size-1]) return _out[size-1];
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// search right interval
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uint8_t pos = 1; // _in[0] already tested
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while(value > _in[pos]) pos++;
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// this will handle all exact "points" in the _in array
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if (value == _in[pos]) return _out[pos];
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// interpolate in the right segment for the rest
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uint8_t pos1 = pos - 1;
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return (value - _in[pos1]) * (_out[pos] - _out[pos1]) / (_in[pos] - _in[pos1]) + _out[pos1];
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}
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///////////////////////////////////////////////////////
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//
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// TSL261R
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//
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TSL261R::TSL261R() : TSL260R()
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{
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// datasheet page 9
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// irradiance parameters
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_aa = 23.34564;
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_bb = -0.03692;
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}
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TSL261R::TSL261R(uint8_t pin, uint16_t maxADC, float voltage) : TSL260R(pin, maxADC, voltage)
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{
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// datasheet page 9
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// irradiance parameters
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_aa = 23.34564;
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_bb = -0.03692;
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}
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///////////////////////////////////////////////////////
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//
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// TSL262R
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//
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TSL262R::TSL262R() : TSL260R()
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{
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// datasheet page 9
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// irradiance parameters
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_aa = 110;
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_bb = 0;
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}
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TSL262R::TSL262R(uint8_t pin, uint16_t maxADC, float voltage) : TSL260R(pin, maxADC, voltage)
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{
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// datasheet page 9
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// irradiance parameters
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_aa = 110;
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_bb = 0;
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}
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// -- END OF FILE --
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