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Adafruit_BME280.h
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Adafruit_BME280.h
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/***************************************************************************
This is a library for the BME280 humidity, temperature & pressure sensor
Designed specifically to work with the Adafruit BME280 Breakout
----> http://www.adafruit.com/products/2650
These sensors use I2C or SPI to communicate, 2 or 4 pins are required
to interface.
Adafruit invests time and resources providing this open source code,
please support Adafruit andopen-source hardware by purchasing products
from Adafruit!
Written by Limor Fried & Kevin Townsend for Adafruit Industries.
BSD license, all text above must be included in any redistribution
***************************************************************************/
#ifndef __BME280_H__
#define __BME280_H__
#if (ARDUINO >= 100)
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include <Adafruit_Sensor.h>
#include <Wire.h>
/*=========================================================================
I2C ADDRESS/BITS
-----------------------------------------------------------------------*/
#define BME280_ADDRESS (0x77)
/*=========================================================================*/
/*=========================================================================
REGISTERS
-----------------------------------------------------------------------*/
enum
{
BME280_REGISTER_DIG_T1 = 0x88,
BME280_REGISTER_DIG_T2 = 0x8A,
BME280_REGISTER_DIG_T3 = 0x8C,
BME280_REGISTER_DIG_P1 = 0x8E,
BME280_REGISTER_DIG_P2 = 0x90,
BME280_REGISTER_DIG_P3 = 0x92,
BME280_REGISTER_DIG_P4 = 0x94,
BME280_REGISTER_DIG_P5 = 0x96,
BME280_REGISTER_DIG_P6 = 0x98,
BME280_REGISTER_DIG_P7 = 0x9A,
BME280_REGISTER_DIG_P8 = 0x9C,
BME280_REGISTER_DIG_P9 = 0x9E,
BME280_REGISTER_DIG_H1 = 0xA1,
BME280_REGISTER_DIG_H2 = 0xE1,
BME280_REGISTER_DIG_H3 = 0xE3,
BME280_REGISTER_DIG_H4 = 0xE4,
BME280_REGISTER_DIG_H5 = 0xE5,
BME280_REGISTER_DIG_H6 = 0xE7,
BME280_REGISTER_CHIPID = 0xD0,
BME280_REGISTER_VERSION = 0xD1,
BME280_REGISTER_SOFTRESET = 0xE0,
BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
BME280_REGISTER_CONTROLHUMID = 0xF2,
BME280_REGISTER_CONTROL = 0xF4,
BME280_REGISTER_CONFIG = 0xF5,
BME280_REGISTER_PRESSUREDATA = 0xF7,
BME280_REGISTER_TEMPDATA = 0xFA,
BME280_REGISTER_HUMIDDATA = 0xFD,
};
/*=========================================================================*/
/*=========================================================================
CALIBRATION DATA
-----------------------------------------------------------------------*/
typedef struct
{
uint16_t dig_T1;
int16_t dig_T2;
int16_t dig_T3;
uint16_t dig_P1;
int16_t dig_P2;
int16_t dig_P3;
int16_t dig_P4;
int16_t dig_P5;
int16_t dig_P6;
int16_t dig_P7;
int16_t dig_P8;
int16_t dig_P9;
uint8_t dig_H1;
int16_t dig_H2;
uint8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
} bme280_calib_data;
/*=========================================================================*/
/*
class Adafruit_BME280_Unified : public Adafruit_Sensor
{
public:
Adafruit_BME280_Unified(int32_t sensorID = -1);
bool begin(uint8_t addr = BME280_ADDRESS);
void getTemperature(float *temp);
void getPressure(float *pressure);
float pressureToAltitude(float seaLevel, float atmospheric, float temp);
float seaLevelForAltitude(float altitude, float atmospheric, float temp);
void getEvent(sensors_event_t*);
void getSensor(sensor_t*);
private:
uint8_t _i2c_addr;
int32_t _sensorID;
};
*/
class Adafruit_BME280
{
public:
Adafruit_BME280(void);
Adafruit_BME280(int8_t cspin);
Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
bool begin(uint8_t addr = BME280_ADDRESS);
float readTemperature(void);
float readPressure(void);
float readHumidity(void);
float readAltitude(float seaLevel);
private:
void readCoefficients(void);
uint8_t spixfer(uint8_t x);
void write8(byte reg, byte value);
uint8_t read8(byte reg);
uint16_t read16(byte reg);
uint32_t read24(byte reg);
int16_t readS16(byte reg);
uint16_t read16_LE(byte reg); // little endian
int16_t readS16_LE(byte reg); // little endian
uint8_t _i2caddr;
int32_t _sensorID;
int32_t t_fine;
int8_t _cs, _mosi, _miso, _sck;
bme280_calib_data _bme280_calib;
};
#endif