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125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
#pragma once
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//
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// FILE: SGP30.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.1
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// DATE: 2021-06-24
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// PURPOSE: Arduino library for SGP30 environment sensor.
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// URL: https://github.com/RobTillaart/SGP30
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// https://www.adafruit.com/product/3709
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#include "Arduino.h"
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#include "Wire.h"
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#define SGP30_LIB_VERSION (F("0.3.1"))
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#define SGP30_OK 0x00
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#define SGP30_ERROR_CRC 0xFF
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#define SGP30_ERROR_I2C 0xFE
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class SGP30
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{
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public:
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explicit SGP30(TwoWire *wire = &Wire);
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bool begin();
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bool isConnected();
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// WARNING resets all I2C devices that support this call !!
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void GenericReset();
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// META
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bool getID();
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uint16_t getFeatureSet();
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bool measureTest(); // need a better name
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// MEASUREMENTS
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// lastMeasurement works only with measure();
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// not with async calls.
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uint32_t lastMeasurement() { return _lastTime; };
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// all == false ==> only TVOC and eCO2
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// blocks 15 - 40 milliseconds (depends on parameter all).
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bool measure(bool all = false);
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// async interface
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void request();
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bool read();
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void requestRaw();
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bool readRaw();
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// get the data // UNITS
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uint16_t getTVOC() { return _tvoc; }; // PPB
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uint16_t getCO2() { return _co2; }; // PPM
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uint16_t getH2_raw() { return _h2; }; // UNKNOWN
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uint16_t getEthanol_raw() { return _ethanol; }; // UNKNOWN
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float getH2(); // experimental // PPM
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float getEthanol(); // experimental // PPM
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// CALIBRATION - read datasheet
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// T in °C
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// RH == 0..100
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float setRelHumidity(float T, float RH); // P10
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// Absolute humidity in grams / m3
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// set Abs Hum to 0 to disables it...
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void setAbsHumidity(float absoluteHumidity);
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void setBaseline(uint16_t CO2, uint16_t TVOC);
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bool getBaseline(uint16_t *CO2, uint16_t *TVOC);
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// See Inceptive Baseline for TVOC measurements in data sheet
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void setTVOCBaseline(uint16_t TVOC);
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bool getTVOCBaseline(uint16_t *TVOC);
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// EXPERIMENTAL
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// 13119 = average raw measured outside 22°C (example)
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void setSrefH2(uint16_t s = 13119) { _srefH2 = s; };
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uint16_t getSrefH2() { return _srefH2; };
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// 18472 = average raw measured outside 22°C (example)
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void setSrefEthanol(uint16_t s = 18472) { _srefEth = s; };
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uint16_t getSrefEthanol() { return _srefEth; };
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// MISCELLANEOUS
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int lastError();
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// need an access function to prevent writing _id[]
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// for now it is OK. TODO private?
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uint8_t _id[6];
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private:
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uint8_t _address;
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int _error;
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uint32_t _lastTime;
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uint32_t _lastRequest;
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// TODO improve?
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int _command(uint16_t cmd);
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int _command(uint16_t cmd, uint16_t v1);
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int _command(uint16_t cmd, uint16_t v1, uint16_t v2);
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uint8_t _CRC8(uint16_t val);
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void _init();
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uint16_t _tvoc;
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uint16_t _co2;
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uint16_t _h2;
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uint16_t _ethanol;
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// experimental
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// average raw values measured outside 22°C
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uint16_t _srefH2 = 13119;
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uint16_t _srefEth = 18472;
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TwoWire* _wire;
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};
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// -- END OF FILE --
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