BME280

BME280 More...

Files
file	bme280.h
	BME280 Temperature, Humidty and Pressure Sensor.

Data Structures
struct	bme280_calib_data
	calibration data structure to hold coefficients More...

Enumerations
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, BME280_REGISTER_CONTROLHUMID = 0xF2, BME280_REGISTER_CONTROL = 0xF4,   BME280_REGISTER_CONFIG = 0xF5, BME280_REGISTER_PRESSUREDATA = 0xF7, BME280_REGISTER_TEMPDATA = 0xFA, BME280_REGISTER_HUMIDDATA = 0xFD }
	register map for BME280 sensor More...

Functions
KSensorStatus	bme280_setup (void)
	Setup the SPI interface for talking with the BME280 and init sensor. More...
KSensorStatus	bme280_soft_reset (void)
	Reset the bme280 to default conditions. More...
KSensorStatus	bme280_read_temperature (float *temp)
	Sends temperature command and reads back temperature data. More...
KSensorStatus	bme280_read_pressure (float *press)
	Sends pressure command and reads back pressure data. More...
KSensorStatus	bme280_read_humidity (float *hum)
	Sends humidity command and reads back humidity. More...
KSensorStatus	bme280_read_altitude (float sea_level, float *alt)
	converts pressure to absolute altitude More...

Variables
uint16_t	bme280_calib_data::dig_T1
int16_t	bme280_calib_data::dig_T2
int16_t	bme280_calib_data::dig_T3
uint16_t	bme280_calib_data::dig_P1
int16_t	bme280_calib_data::dig_P2
int16_t	bme280_calib_data::dig_P3
int16_t	bme280_calib_data::dig_P4
int16_t	bme280_calib_data::dig_P5
int16_t	bme280_calib_data::dig_P6
int16_t	bme280_calib_data::dig_P7
int16_t	bme280_calib_data::dig_P8
int16_t	bme280_calib_data::dig_P9
uint8_t	bme280_calib_data::dig_H1
int16_t	bme280_calib_data::dig_H2
uint8_t	bme280_calib_data::dig_H3
int16_t	bme280_calib_data::dig_H4
int16_t	bme280_calib_data::dig_H5
int8_t	bme280_calib_data::dig_H6

Enumeration Type Documentation

anonymous enum

register map for BME280 sensor

Enumerator
BME280_REGISTER_DIG_T1
BME280_REGISTER_DIG_T2
BME280_REGISTER_DIG_T3
BME280_REGISTER_DIG_P1
BME280_REGISTER_DIG_P2
BME280_REGISTER_DIG_P3
BME280_REGISTER_DIG_P4
BME280_REGISTER_DIG_P5
BME280_REGISTER_DIG_P6
BME280_REGISTER_DIG_P7
BME280_REGISTER_DIG_P8
BME280_REGISTER_DIG_P9
BME280_REGISTER_DIG_H1
BME280_REGISTER_DIG_H2
BME280_REGISTER_DIG_H3
BME280_REGISTER_DIG_H4
BME280_REGISTER_DIG_H5
BME280_REGISTER_DIG_H6
BME280_REGISTER_CHIPID
BME280_REGISTER_VERSION
BME280_REGISTER_SOFTRESET
BME280_REGISTER_CAL26
BME280_REGISTER_CONTROLHUMID
BME280_REGISTER_CONTROL
BME280_REGISTER_CONFIG
BME280_REGISTER_PRESSUREDATA
BME280_REGISTER_TEMPDATA
BME280_REGISTER_HUMIDDATA

Function Documentation

KSensorStatus bme280_read_altitude	(	float	sea_level,
		float *	alt
	)

converts pressure to absolute altitude

Parameters

sea_level	in hPa (1013.25 recommended)
alt	pointer to altitude in meters (m)

Returns

KSensorStatus, SENSOR_OK on success, SENSOR_ERROR or SENSOR_READ_ERROR on error

KSensorStatus bme280_read_humidity

(

float *

hum

)

Sends humidity command and reads back humidity.

Parameters

hum	pointer to humidity in percentage (0.0 - 100.0)

Returns

KSensorStatus, SENSOR_OK on success,SENSOR_ERROR or SENSOR_READ_ERROR on error

KSensorStatus bme280_read_pressure

(

float *

press

)

Sends pressure command and reads back pressure data.

Parameters

press

pointer to pressure data in Pa (101325.0 - 0.0)

Returns

KSensorStatus, SENSOR_OK on success, SENSOR_ERROR or SENSOR_READ_ERROR on error

KSensorStatus bme280_read_temperature

(

float *

temp

)

Sends temperature command and reads back temperature data.

Parameters

temp	pointer to temperature data in celsius (-40.0 to 85.0)

Returns

KSensorStatus, SENSOR_OK on success, SENSOR_ERROR or SENSOR_READ_ERROR on error

KSensorStatus bme280_setup

(

void

)

Setup the SPI interface for talking with the BME280 and init sensor.

Returns

KSensorStatus, SENSOR_OK on success, SENSOR_WRITE_ERROR or SENSOR_NOT_FOUND on error

KSensorStatus bme280_soft_reset

(

void

)

Reset the bme280 to default conditions.

Returns

KSensorStatus, SENSOR_OK on success, SENSOR_WRITE_ERROR on error

Variable Documentation

uint8_t bme280_calib_data::dig_H1

int16_t bme280_calib_data::dig_H2

uint8_t bme280_calib_data::dig_H3

int16_t bme280_calib_data::dig_H4

int16_t bme280_calib_data::dig_H5

int8_t bme280_calib_data::dig_H6

uint16_t bme280_calib_data::dig_P1

int16_t bme280_calib_data::dig_P2

int16_t bme280_calib_data::dig_P3

int16_t bme280_calib_data::dig_P4

int16_t bme280_calib_data::dig_P5

int16_t bme280_calib_data::dig_P6

int16_t bme280_calib_data::dig_P7

int16_t bme280_calib_data::dig_P8

int16_t bme280_calib_data::dig_P9

uint16_t bme280_calib_data::dig_T1

int16_t bme280_calib_data::dig_T2

int16_t bme280_calib_data::dig_T3