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83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
//
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// FILE: AnalogUVSensor.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// DATE: 2021-09-25
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// PURPOSE: AnalogUVSensor library
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//
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// HISTORY:
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// 0.1.0 2021-09-25 initial version
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// 0.1.1 2021-10-17 update build-CI, readme.md
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// refactor, plotter example
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// 0.1.2 2021-12-12 update library.json, license, minor edits.
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#include "AnalogUVSensor.h"
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AnalogUVSensor::AnalogUVSensor()
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{
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// defaults from UNO.
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_analogPin = 14; // A0
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_volts = 5;
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_maxADC = 1023;
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_powerPin = -1;
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_invert = false;
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}
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void AnalogUVSensor::begin(uint8_t analogPin, float volts, uint16_t maxADC)
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{
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_analogPin = analogPin;
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_volts = volts;
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_maxADC = maxADC;
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}
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float AnalogUVSensor::read(uint8_t times)
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{
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uint32_t sum = 0;
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if (times == 0) times = 1;
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for (int i = 0; i < times; i++)
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{
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sum += analogRead(_analogPin);
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}
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uint16_t milliVolt = sum * (_volts * 1000.0) / (times * _maxADC);
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return mV2index(milliVolt);
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}
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float AnalogUVSensor::mV2index(uint16_t milliVolt)
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{
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if (milliVolt < 50) return 0.0;
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// linear interpolation between 0..1
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if (milliVolt < 227) return 0.0 + (1.0 * milliVolt - 50.0) / (227.0 - 50.0);
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// linear interpolation between 1..11
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// formula derived with spreadsheet.
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if (milliVolt < 1200) return 0.0104865310 * milliVolt - 1.289154988;
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return 12;
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}
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char AnalogUVSensor::index2color(float index)
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{
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if (index <= 2) return 'G';
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if (index <= 5) return 'Y';
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if (index <= 7) return 'O';
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if (index <= 10) return 'R';
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return 'P';
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}
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void AnalogUVSensor::setPowerPin(uint8_t powerPin, bool invert)
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{
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_invert = invert;
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_powerPin = powerPin;
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pinMode(_powerPin, OUTPUT);
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switchOn();
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}
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// -- END OF FILE --
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