75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
/**************************************************************************/
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/*!
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@file Adafruit_Si7021.h
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@author Limor Fried (Adafruit Industries)
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@license BSD (see license.txt)
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This is a library for the Adafruit Si7021 breakout board
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----> https://www.adafruit.com/products/3251
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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@section HISTORY
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v1.0 - First release
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*/
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/**************************************************************************/
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#ifndef __Si7021_H__
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#define __Si7021_H__
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#if ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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/*=========================================================================
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I2C ADDRESS/BITS
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-----------------------------------------------------------------------*/
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#define SI7021_DEFAULT_ADDRESS (0x40)
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#define SI7021_MEASRH_HOLD_CMD 0xE5
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#define SI7021_MEASRH_NOHOLD_CMD 0xF5
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#define SI7021_MEASTEMP_HOLD_CMD 0xE3
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#define SI7021_MEASTEMP_NOHOLD_CMD 0xF3
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#define SI7021_READPREVTEMP_CMD 0xE0
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#define SI7021_RESET_CMD 0xFE
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#define SI7021_WRITERHT_REG_CMD 0xE6
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#define SI7021_READRHT_REG_CMD 0xE7
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#define SI7021_WRITEHEATER_REG_CMD 0x51
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#define SI7021_READHEATER_REG_CMD 0x11
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#define SI7021_ID1_CMD 0xFA0F
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#define SI7021_ID2_CMD 0xFCC9
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#define SI7021_FIRMVERS_CMD 0x84B8
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/*=========================================================================*/
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class Adafruit_Si7021 {
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public:
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Adafruit_Si7021(void);
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bool begin(void);
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float readTemperature(void);
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void reset(void);
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void readSerialNumber(void);
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float readHumidity(void);
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uint32_t sernum_a, sernum_b;
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private:
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uint8_t readRegister8(uint8_t reg);
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uint16_t readRegister16(uint8_t reg);
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void writeRegister8(uint8_t reg, uint8_t value);
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int8_t _i2caddr;
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};
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/**************************************************************************/
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#endif // __Si7021_H__
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