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https://github.com/RobTillaart/Arduino.git
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88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
#pragma once
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//
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// FILE: MTP40C.h
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// AUTHOR: Rob Tillaart
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// DATE: 2021-08-20
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// VERSION: 0.1.1
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// PURPOSE: Arduino library for MTP40C CO2 sensor
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// URL: https://github.com/RobTillaart/MTP40C
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//
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// HISTORY:
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// see MTP40C.cpp file
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//
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// Based upon datasheet June 2020, version 2.0
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//
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#include "Arduino.h"
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#define MTP40C_LIB_VERSION (F("0.1.1"))
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#define MTP40C_DEFAULT_ADDRESS 0x64
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#define MTP40C_INVALID_AIR_PRESSURE 0x00
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#define MTP40C_INVALID_GAS_LEVEL 0x00
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#define MTP40C_INVALID_ADDRESS 0xFF
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class MTP40C
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{
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public:
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MTP40C(Stream * str);
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bool begin(uint8_t address = 0x64);
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bool isConnected();
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uint8_t getAddress();
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bool setAddress(uint8_t address);
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float getAirPressure();
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bool setAirPressureReference(float apr);
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uint16_t getGasConcentration(); // returns PPM
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// CALIBRATION FUNCTIONS
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// READ DATASHEET !!
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bool setSinglePointCorrection(float spc);
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bool getSinglePointCorrectionReady();
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bool openSelfCalibration();
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bool closeSelfCalibration();
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uint8_t getSelfCalibrationStatus();
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bool setSelfCalibrationHours(uint16_t hrs);
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uint16_t getSelfCalibrationHours();
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void setGenericAddress() { _useAddress = false; };
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void setSpecificAddress() { _useAddress = true; };
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bool useSpecificAddress() { return _useAddress; };
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// set timeout of serial communication.
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void setTimeout(uint32_t to = 100) { _timeout = to; };
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uint32_t getTimeout() { return _timeout; };
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uint32_t lastRead() { return _lastRead; };
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/////////////////////////
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private:
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Stream * _ser;
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char _buffer[256]; // datasheet states 256 - why ???
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uint8_t _address = 64;
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bool _useAddress = false;
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uint32_t _timeout = 100;
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uint32_t _lastRead = 0;
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float _airPressure = 0;
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uint16_t _gasLevel = 0;
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bool request(uint8_t *data, uint8_t cmdlen, uint8_t anslen);
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uint16_t CRC(uint8_t *data, uint16_t len);
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};
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// -- END OF FILE --
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