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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_STATUS = 0XF3,
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:
enum sensor_sampling {
SAMPLING_NONE = 0b000,
SAMPLING_X1 = 0b001,
SAMPLING_X2 = 0b010,
SAMPLING_X4 = 0b011,
SAMPLING_X8 = 0b100,
SAMPLING_X16 = 0b101
};
enum sensor_mode {
MODE_SLEEP = 0b00,
MODE_FORCED = 0b01,
MODE_NORMAL = 0b11
};
enum sensor_filter {
FILTER_OFF = 0b000,
FILTER_X2 = 0b001,
FILTER_X4 = 0b010,
FILTER_X8 = 0b011,
FILTER_X16 = 0b100
};
// standby durations in ms
enum standby_duration {
STANDBY_MS_0_5 = 0b000,
STANDBY_MS_10 = 0b110,
STANDBY_MS_20 = 0b111,
STANDBY_MS_62_5 = 0b001,
STANDBY_MS_125 = 0b010,
STANDBY_MS_250 = 0b011,
STANDBY_MS_500 = 0b100,
STANDBY_MS_1000 = 0b101
};
// constructors
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);
void setSampling(sensor_mode mode = MODE_NORMAL,
sensor_sampling tempSampling = SAMPLING_X16,
sensor_sampling pressSampling = SAMPLING_X16,
sensor_sampling humSampling = SAMPLING_X16,
sensor_filter filter = FILTER_OFF,
standby_duration duration = STANDBY_MS_0_5
);
void takeForcedMeasurement();
float readTemperature(void);
float readPressure(void);
float readHumidity(void);
float readAltitude(float seaLevel);
float seaLevelForAltitude(float altitude, float pressure);
private:
void readCoefficients(void);
bool isReadingCalibration(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;
// The config register
struct config {
// inactive duration (standby time) in normal mode
// 000 = 0.5 ms
// 001 = 62.5 ms
// 010 = 125 ms
// 011 = 250 ms
// 100 = 500 ms
// 101 = 1000 ms
// 110 = 10 ms
// 111 = 20 ms
unsigned int t_sb : 3;
// filter settings
// 000 = filter off
// 001 = 2x filter
// 010 = 4x filter
// 011 = 8x filter
// 100 and above = 16x filter
unsigned int filter : 3;
// unused - don't set
unsigned int none : 1;
unsigned int spi3w_en : 1;
unsigned int get() {
return (t_sb << 5) | (filter << 3) | spi3w_en;
}
};
config _configReg;
// The ctrl_meas register
struct ctrl_meas {
// temperature oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_t : 3;
// pressure oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_p : 3;
// device mode
// 00 = sleep
// 01 or 10 = forced
// 11 = normal
unsigned int mode : 2;
unsigned int get() {
return (osrs_t << 5) | (osrs_p << 3) | mode;
}
};
ctrl_meas _measReg;
// The ctrl_hum register
struct ctrl_hum {
// unused - don't set
unsigned int none : 5;
// pressure oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_h : 3;
unsigned int get() {
return (osrs_h);
}
};
ctrl_hum _humReg;
};
#endif
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