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https://github.com/RobTillaart/Arduino.git
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78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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#pragma once
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//
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// FILE: DHT20.h
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// AUTHOR: Rob Tillaart
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// PURPOSE: Arduino library for DHT20 I2C temperature and humidity sensor.
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// VERSION: 0.1.0
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// HISTORY: See DHT20.cpp
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// URL: https://github.com/RobTillaart/DHT20
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//
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#include "Arduino.h"
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#include "Wire.h"
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#define DHT20_LIB_VERSION (F("0.1.0"))
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#define DHT20_OK 0
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#define DHT20_ERROR_CHECKSUM -10
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#define DHT20_ERROR_CONNECT -11
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#define DHT20_MISSING_BYTES -12
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class DHT20
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{
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public:
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DHT20(TwoWire *wire = &Wire); // to be tested explicitly
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#if defined(ESP8266) || defined(ESP32)
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bool begin(const uint8_t dataPin, const uint8_t clockPin);
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#endif
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bool begin();
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bool isConnected();
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// ASYNCHRONUOUS CALL
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int requestData() { return _requestData(); };
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bool readyData();
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int readData() { return _readData(); };
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// SYNCHRONUOUS CALL
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int read();
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float getHumidity() { return _humidity + _humOffset; };
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float getTemperature() { return _temperature + _tempOffset; };
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// allows 1st order calibration
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void setHumOffset(float offset) { _humOffset = offset; };
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void setTempOffset(float offset) { _tempOffset = offset; };
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float getHumOffset() { return _humOffset; };
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float getTempOffset() { return _tempOffset; };
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// OTHER
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uint32_t lastRead() { return _lastRead; };
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uint32_t lastRequest() { return _lastRequest; };
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int internalStatus() { return _status; };
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private:
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float _humidity;
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float _temperature;
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float _humOffset;
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float _tempOffset;
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uint8_t _status;
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uint32_t _lastRequest;
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uint32_t _lastRead;
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int _requestData();
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int _readData();
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int _readStatus();
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uint8_t _bits[7];
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uint8_t _crc8(uint8_t *ptr, uint8_t len);
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TwoWire* _wire;
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};
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// -- END OF FILE --
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