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134 lines
2.8 KiB
C++
134 lines
2.8 KiB
C++
//
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// FILE: TSL235R.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.5
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// DATE: 2020-05-29
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// PURPOSE: library for the TSL235R light to frequency convertor
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// URL: https://github.com/RobTillaart/TSL235R
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#include "TSL235R.h"
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TSL235R::TSL235R(float voltage)
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{
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_waveLength = 635;
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_waveLengthFactor = 1.0;
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_voltageFactor = 1.0;
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_voltage = voltage;
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calculateFactor();
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}
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float TSL235R::irradiance(uint32_t Hz)
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{
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return Hz * _factor;
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}
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float TSL235R::irradiance(uint32_t pulses, uint32_t milliseconds)
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{
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return (pulses * 1000.0 * _factor) / milliseconds;
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}
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float TSL235R::irradiance_HS(uint32_t pulses, uint32_t microseconds)
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{
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return (pulses * 1000000.0 * _factor) / microseconds;
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}
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float TSL235R::getFactor()
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{
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return _factor;
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}
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void TSL235R::setWavelength(uint16_t wavelength)
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{
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_waveLength = wavelength;
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calculateFactor();
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}
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uint16_t TSL235R::getWavelength()
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{
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return _waveLength;
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}
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float TSL235R::getWaveLengthFactor()
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{
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return _waveLengthFactor;
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}
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void TSL235R::setVoltage(float voltage)
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{
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_voltage = voltage;
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calculateFactor();
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}
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float TSL235R::getVoltage()
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{
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return _voltage;
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}
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float TSL235R::getVoltageFactor()
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{
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return _voltageFactor;
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}
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void TSL235R::calculateFactor()
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{
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// figure 1 datasheet
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// 1 KHz crosses the line at 35/230 between 1 and 10.
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// so the correction factor is 10^0.15217 = 1.419659
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// as the graph is in kHz we need to correct a factor 1000
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// as the irradiance function gets Hz
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const float cf = 0.001419659;
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_waveLengthFactor = calculateWaveLengthFactor(_waveLength);
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_voltageFactor = 0.988 + (_voltage - 2.7) * (0.015 / 2.8);
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_factor = cf * _waveLengthFactor * _voltageFactor;
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}
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float TSL235R::calculateWaveLengthFactor(uint16_t _waveLength)
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{
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// figure 2 datasheet
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// 635 nm is reference 1.000
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// remaining is linear interpolated between points in the graph
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float in[] = { 300, 350, 400, 500, 600, 635, 700, 750, 800, 850, 900, 1000, 1100};
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float out[] = { 0.1, 0.35, 0.5, 0.75, 0.93, 1.00, 1.15, 1.20, 1.15, 1.10, 0.95, 0.40, 0.10};
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return 1.0 / multiMap(_waveLength, in, out, 13);
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}
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// from https://github.com/RobTillaart/MultiMap
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float TSL235R::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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// -- END OF FILE --
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