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This commit is contained in:
Daniel Stoppek
2025-02-28 14:30:08 +01:00
parent ea0f514c2b
commit ae617cade4
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libraries/Adafruit_BME280_Library/Adafruit_BME280.cpp Normal file
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/*!
* @file Adafruit_BME280.cpp
*
* @mainpage Adafruit BME280 humidity, temperature & pressure sensor
*
* @section intro_sec Introduction
*
* Driver for the BME280 humidity, temperature & pressure sensor
*
* These sensors use I2C or SPI to communicate, 2 or 4 pins are required
* to interface.
*
* Designed specifically to work with the Adafruit BME280 Breakout
* ----> http://www.adafruit.com/products/2652
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit and open-source hardware by purchasing
* products from Adafruit!
*
* @section author Author
*
* Written by Kevin "KTOWN" Townsend for Adafruit Industries.
*
* @section license License
*
* BSD license, all text here must be included in any redistribution.
* See the LICENSE file for details.
*
*/
#include "Adafruit_BME280.h"
#include "Arduino.h"
/*!
* @brief class constructor
*/
Adafruit_BME280::Adafruit_BME280() {}
/*!
* @brief class constructor if using hardware SPI
* @param cspin the chip select pin to use
* @param *theSPI
* optional SPI object
*/
Adafruit_BME280::Adafruit_BME280(int8_t cspin, SPIClass *theSPI) {
spi_dev = new Adafruit_SPIDevice(cspin, 1000000, SPI_BITORDER_MSBFIRST,
SPI_MODE0, theSPI);
}
/*!
* @brief class constructor if using software SPI
* @param cspin the chip select pin to use
* @param mosipin the MOSI pin to use
* @param misopin the MISO pin to use
* @param sckpin the SCK pin to use
*/
Adafruit_BME280::Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin,
int8_t sckpin) {
spi_dev = new Adafruit_SPIDevice(cspin, sckpin, misopin, mosipin);
}
Adafruit_BME280::~Adafruit_BME280(void) {
if (spi_dev) {
delete spi_dev;
}
if (i2c_dev) {
delete i2c_dev;
}
if (temp_sensor) {
delete temp_sensor;
}
if (pressure_sensor) {
delete pressure_sensor;
}
if (humidity_sensor) {
delete humidity_sensor;
}
}
/*!
* @brief Initialise sensor with given parameters / settings
* @param addr the I2C address the device can be found on
* @param theWire the I2C object to use, defaults to &Wire
* @returns true on success, false otherwise
*/
bool Adafruit_BME280::begin(uint8_t addr, TwoWire *theWire) {
if (spi_dev == NULL) {
// I2C mode
if (i2c_dev)
delete i2c_dev;
i2c_dev = new Adafruit_I2CDevice(addr, theWire);
if (!i2c_dev->begin())
return false;
} else {
// SPI mode
if (!spi_dev->begin())
return false;
}
return init();
}
/*!
* @brief Initialise sensor with given parameters / settings
* @returns true on success, false otherwise
*/
bool Adafruit_BME280::init() {
// check if sensor, i.e. the chip ID is correct
_sensorID = read8(BME280_REGISTER_CHIPID);
if (_sensorID != 0x60)
return false;
// reset the device using soft-reset
// this makes sure the IIR is off, etc.
write8(BME280_REGISTER_SOFTRESET, 0xB6);
// wait for chip to wake up.
delay(10);
// if chip is still reading calibration, delay
while (isReadingCalibration())
delay(10);
readCoefficients(); // read trimming parameters, see DS 4.2.2
setSampling(); // use defaults
delay(100);
return true;
}
/*!
* @brief setup sensor with given parameters / settings
*
* This is simply a overload to the normal begin()-function, so SPI users
* don't get confused about the library requiring an address.
* @param mode the power mode to use for the sensor
* @param tempSampling the temp samping rate to use
* @param pressSampling the pressure sampling rate to use
* @param humSampling the humidity sampling rate to use
* @param filter the filter mode to use
* @param duration the standby duration to use
*/
void Adafruit_BME280::setSampling(sensor_mode mode,
sensor_sampling tempSampling,
sensor_sampling pressSampling,
sensor_sampling humSampling,
sensor_filter filter,
standby_duration duration) {
_measReg.mode = mode;
_measReg.osrs_t = tempSampling;
_measReg.osrs_p = pressSampling;
_humReg.osrs_h = humSampling;
_configReg.filter = filter;
_configReg.t_sb = duration;
_configReg.spi3w_en = 0;
// making sure sensor is in sleep mode before setting configuration
// as it otherwise may be ignored
write8(BME280_REGISTER_CONTROL, MODE_SLEEP);
// you must make sure to also set REGISTER_CONTROL after setting the
// CONTROLHUMID register, otherwise the values won't be applied (see
// DS 5.4.3)
write8(BME280_REGISTER_CONTROLHUMID, _humReg.get());
write8(BME280_REGISTER_CONFIG, _configReg.get());
write8(BME280_REGISTER_CONTROL, _measReg.get());
}
/*!
* @brief Writes an 8 bit value over I2C or SPI
* @param reg the register address to write to
* @param value the value to write to the register
*/
void Adafruit_BME280::write8(byte reg, byte value) {
byte buffer[2];
buffer[1] = value;
if (i2c_dev) {
buffer[0] = reg;
i2c_dev->write(buffer, 2);
} else {
buffer[0] = reg & ~0x80;
spi_dev->write(buffer, 2);
}
}
/*!
* @brief Reads an 8 bit value over I2C or SPI
* @param reg the register address to read from
* @returns the data byte read from the device
*/
uint8_t Adafruit_BME280::read8(byte reg) {
uint8_t buffer[1];
if (i2c_dev) {
buffer[0] = uint8_t(reg);
i2c_dev->write_then_read(buffer, 1, buffer, 1);
} else {
buffer[0] = uint8_t(reg | 0x80);
spi_dev->write_then_read(buffer, 1, buffer, 1);
}
return buffer[0];
}
/*!
* @brief Reads a 16 bit value over I2C or SPI
* @param reg the register address to read from
* @returns the 16 bit data value read from the device
*/
uint16_t Adafruit_BME280::read16(byte reg) {
uint8_t buffer[2];
if (i2c_dev) {
buffer[0] = uint8_t(reg);
i2c_dev->write_then_read(buffer, 1, buffer, 2);
} else {
buffer[0] = uint8_t(reg | 0x80);
spi_dev->write_then_read(buffer, 1, buffer, 2);
}
return uint16_t(buffer[0]) << 8 | uint16_t(buffer[1]);
}
/*!
* @brief Reads a signed 16 bit little endian value over I2C or SPI
* @param reg the register address to read from
* @returns the 16 bit data value read from the device
*/
uint16_t Adafruit_BME280::read16_LE(byte reg) {
uint16_t temp = read16(reg);
return (temp >> 8) | (temp << 8);
}
/*!
* @brief Reads a signed 16 bit value over I2C or SPI
* @param reg the register address to read from
* @returns the 16 bit data value read from the device
*/
int16_t Adafruit_BME280::readS16(byte reg) { return (int16_t)read16(reg); }
/*!
* @brief Reads a signed little endian 16 bit value over I2C or SPI
* @param reg the register address to read from
* @returns the 16 bit data value read from the device
*/
int16_t Adafruit_BME280::readS16_LE(byte reg) {
return (int16_t)read16_LE(reg);
}
/*!
* @brief Reads a 24 bit value over I2C
* @param reg the register address to read from
* @returns the 24 bit data value read from the device
*/
uint32_t Adafruit_BME280::read24(byte reg) {
uint8_t buffer[3];
if (i2c_dev) {
buffer[0] = uint8_t(reg);
i2c_dev->write_then_read(buffer, 1, buffer, 3);
} else {
buffer[0] = uint8_t(reg | 0x80);
spi_dev->write_then_read(buffer, 1, buffer, 3);
}
return uint32_t(buffer[0]) << 16 | uint32_t(buffer[1]) << 8 |
uint32_t(buffer[2]);
}
/*!
* @brief Take a new measurement (only possible in forced mode)
@returns true in case of success else false
*/
bool Adafruit_BME280::takeForcedMeasurement(void) {
bool return_value = false;
// If we are in forced mode, the BME sensor goes back to sleep after each
// measurement and we need to set it to forced mode once at this point, so
// it will take the next measurement and then return to sleep again.
// In normal mode simply does new measurements periodically.
if (_measReg.mode == MODE_FORCED) {
return_value = true;
// set to forced mode, i.e. "take next measurement"
write8(BME280_REGISTER_CONTROL, _measReg.get());
// Store current time to measure the timeout
uint32_t timeout_start = millis();
// wait until measurement has been completed, otherwise we would read the
// the values from the last measurement or the timeout occurred after 2 sec.
while (read8(BME280_REGISTER_STATUS) & 0x08) {
// In case of a timeout, stop the while loop
if ((millis() - timeout_start) > 2000) {
return_value = false;
break;
}
delay(1);
}
}
return return_value;
}
/*!
* @brief Reads the factory-set coefficients
*/
void Adafruit_BME280::readCoefficients(void) {
_bme280_calib.dig_T1 = read16_LE(BME280_REGISTER_DIG_T1);
_bme280_calib.dig_T2 = readS16_LE(BME280_REGISTER_DIG_T2);
_bme280_calib.dig_T3 = readS16_LE(BME280_REGISTER_DIG_T3);
_bme280_calib.dig_P1 = read16_LE(BME280_REGISTER_DIG_P1);
_bme280_calib.dig_P2 = readS16_LE(BME280_REGISTER_DIG_P2);
_bme280_calib.dig_P3 = readS16_LE(BME280_REGISTER_DIG_P3);
_bme280_calib.dig_P4 = readS16_LE(BME280_REGISTER_DIG_P4);
_bme280_calib.dig_P5 = readS16_LE(BME280_REGISTER_DIG_P5);
_bme280_calib.dig_P6 = readS16_LE(BME280_REGISTER_DIG_P6);
_bme280_calib.dig_P7 = readS16_LE(BME280_REGISTER_DIG_P7);
_bme280_calib.dig_P8 = readS16_LE(BME280_REGISTER_DIG_P8);
_bme280_calib.dig_P9 = readS16_LE(BME280_REGISTER_DIG_P9);
_bme280_calib.dig_H1 = read8(BME280_REGISTER_DIG_H1);
_bme280_calib.dig_H2 = readS16_LE(BME280_REGISTER_DIG_H2);
_bme280_calib.dig_H3 = read8(BME280_REGISTER_DIG_H3);
_bme280_calib.dig_H4 = ((int8_t)read8(BME280_REGISTER_DIG_H4) << 4) |
(read8(BME280_REGISTER_DIG_H4 + 1) & 0xF);
_bme280_calib.dig_H5 = ((int8_t)read8(BME280_REGISTER_DIG_H5 + 1) << 4) |
(read8(BME280_REGISTER_DIG_H5) >> 4);
_bme280_calib.dig_H6 = (int8_t)read8(BME280_REGISTER_DIG_H6);
}
/*!
* @brief return true if chip is busy reading cal data
* @returns true if reading calibration, false otherwise
*/
bool Adafruit_BME280::isReadingCalibration(void) {
uint8_t const rStatus = read8(BME280_REGISTER_STATUS);
return (rStatus & (1 << 0)) != 0;
}
/*!
* @brief Returns the temperature from the sensor
* @returns the temperature read from the device
*/
float Adafruit_BME280::readTemperature(void) {
int32_t var1, var2;
int32_t adc_T = read24(BME280_REGISTER_TEMPDATA);
if (adc_T == 0x800000) // value in case temp measurement was disabled
return NAN;
adc_T >>= 4;
var1 = (int32_t)((adc_T / 8) - ((int32_t)_bme280_calib.dig_T1 * 2));
var1 = (var1 * ((int32_t)_bme280_calib.dig_T2)) / 2048;
var2 = (int32_t)((adc_T / 16) - ((int32_t)_bme280_calib.dig_T1));
var2 = (((var2 * var2) / 4096) * ((int32_t)_bme280_calib.dig_T3)) / 16384;
t_fine = var1 + var2 + t_fine_adjust;
int32_t T = (t_fine * 5 + 128) / 256;
return (float)T / 100;
}
/*!
* @brief Returns the pressure from the sensor
* @returns the pressure value (in Pascal) read from the device
*/
float Adafruit_BME280::readPressure(void) {
int64_t var1, var2, var3, var4;
readTemperature(); // must be done first to get t_fine
int32_t adc_P = read24(BME280_REGISTER_PRESSUREDATA);
if (adc_P == 0x800000) // value in case pressure measurement was disabled
return NAN;
adc_P >>= 4;
var1 = ((int64_t)t_fine) - 128000;
var2 = var1 * var1 * (int64_t)_bme280_calib.dig_P6;
var2 = var2 + ((var1 * (int64_t)_bme280_calib.dig_P5) * 131072);
var2 = var2 + (((int64_t)_bme280_calib.dig_P4) * 34359738368);
var1 = ((var1 * var1 * (int64_t)_bme280_calib.dig_P3) / 256) +
((var1 * ((int64_t)_bme280_calib.dig_P2) * 4096));
var3 = ((int64_t)1) * 140737488355328;
var1 = (var3 + var1) * ((int64_t)_bme280_calib.dig_P1) / 8589934592;
if (var1 == 0) {
return 0; // avoid exception caused by division by zero
}
var4 = 1048576 - adc_P;
var4 = (((var4 * 2147483648) - var2) * 3125) / var1;
var1 = (((int64_t)_bme280_calib.dig_P9) * (var4 / 8192) * (var4 / 8192)) /
33554432;
var2 = (((int64_t)_bme280_calib.dig_P8) * var4) / 524288;
var4 = ((var4 + var1 + var2) / 256) + (((int64_t)_bme280_calib.dig_P7) * 16);
float P = var4 / 256.0;
return P;
}
/*!
* @brief Returns the humidity from the sensor
* @returns the humidity value read from the device
*/
float Adafruit_BME280::readHumidity(void) {
int32_t var1, var2, var3, var4, var5;
readTemperature(); // must be done first to get t_fine
int32_t adc_H = read16(BME280_REGISTER_HUMIDDATA);
if (adc_H == 0x8000) // value in case humidity measurement was disabled
return NAN;
var1 = t_fine - ((int32_t)76800);
var2 = (int32_t)(adc_H * 16384);
var3 = (int32_t)(((int32_t)_bme280_calib.dig_H4) * 1048576);
var4 = ((int32_t)_bme280_calib.dig_H5) * var1;
var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
var2 = (var1 * ((int32_t)_bme280_calib.dig_H6)) / 1024;
var3 = (var1 * ((int32_t)_bme280_calib.dig_H3)) / 2048;
var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
var2 = ((var4 * ((int32_t)_bme280_calib.dig_H2)) + 8192) / 16384;
var3 = var5 * var2;
var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
var5 = var3 - ((var4 * ((int32_t)_bme280_calib.dig_H1)) / 16);
var5 = (var5 < 0 ? 0 : var5);
var5 = (var5 > 419430400 ? 419430400 : var5);
uint32_t H = (uint32_t)(var5 / 4096);
return (float)H / 1024.0;
}
/*!
* Calculates the altitude (in meters) from the specified atmospheric
* pressure (in hPa), and sea-level pressure (in hPa).
* @param seaLevel Sea-level pressure in hPa
* @returns the altitude value read from the device
*/
float Adafruit_BME280::readAltitude(float seaLevel) {
// Equation taken from BMP180 datasheet (page 16):
// http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
// Note that using the equation from wikipedia can give bad results
// at high altitude. See this thread for more information:
// http://forums.adafruit.com/viewtopic.php?f=22&t=58064
float atmospheric = readPressure() / 100.0F;
return 44330.0 * (1.0 - pow(atmospheric / seaLevel, 0.1903));
}
/*!
* Calculates the pressure at sea level (in hPa) from the specified
* altitude (in meters), and atmospheric pressure (in hPa).
* @param altitude Altitude in meters
* @param atmospheric Atmospheric pressure in hPa
* @returns the pressure at sea level (in hPa) from the specified altitude
*/
float Adafruit_BME280::seaLevelForAltitude(float altitude, float atmospheric) {
// Equation taken from BMP180 datasheet (page 17):
// http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
// Note that using the equation from wikipedia can give bad results
// at high altitude. See this thread for more information:
// http://forums.adafruit.com/viewtopic.php?f=22&t=58064
return atmospheric / pow(1.0 - (altitude / 44330.0), 5.255);
}
/*!
* Returns Sensor ID found by init() for diagnostics
* @returns Sensor ID 0x60 for BME280, 0x56, 0x57, 0x58 BMP280
*/
uint32_t Adafruit_BME280::sensorID(void) { return _sensorID; }
/*!
* Returns the current temperature compensation value in degrees Celsius
* @returns the current temperature compensation value in degrees Celsius
*/
float Adafruit_BME280::getTemperatureCompensation(void) {
return float((t_fine_adjust * 5) >> 8) / 100.0;
};
/*!
* Sets a value to be added to each temperature reading. This adjusted
* temperature is used in pressure and humidity readings.
* @param adjustment Value to be added to each temperature reading in Celsius
*/
void Adafruit_BME280::setTemperatureCompensation(float adjustment) {
// convert the value in C into and adjustment to t_fine
t_fine_adjust = ((int32_t(adjustment * 100) << 8)) / 5;
};
/*!
@brief Gets an Adafruit Unified Sensor object for the temp sensor component
@return Adafruit_Sensor pointer to temperature sensor
*/
Adafruit_Sensor *Adafruit_BME280::getTemperatureSensor(void) {
if (!temp_sensor) {
temp_sensor = new Adafruit_BME280_Temp(this);
}
return temp_sensor;
}
/*!
@brief Gets an Adafruit Unified Sensor object for the pressure sensor
component
@return Adafruit_Sensor pointer to pressure sensor
*/
Adafruit_Sensor *Adafruit_BME280::getPressureSensor(void) {
if (!pressure_sensor) {
pressure_sensor = new Adafruit_BME280_Pressure(this);
}
return pressure_sensor;
}
/*!
@brief Gets an Adafruit Unified Sensor object for the humidity sensor
component
@return Adafruit_Sensor pointer to humidity sensor
*/
Adafruit_Sensor *Adafruit_BME280::getHumiditySensor(void) {
if (!humidity_sensor) {
humidity_sensor = new Adafruit_BME280_Humidity(this);
}
return humidity_sensor;
}
/**************************************************************************/
/*!
@brief Gets the sensor_t data for the BME280's temperature sensor
*/
/**************************************************************************/
void Adafruit_BME280_Temp::getSensor(sensor_t *sensor) {
/* Clear the sensor_t object */
memset(sensor, 0, sizeof(sensor_t));
/* Insert the sensor name in the fixed length char array */
strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
sensor->name[sizeof(sensor->name) - 1] = 0;
sensor->version = 1;
sensor->sensor_id = _sensorID;
sensor->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
sensor->min_delay = 0;
sensor->min_value = -40.0; /* Temperature range -40 ~ +85 C */
sensor->max_value = +85.0;
sensor->resolution = 0.01; /* 0.01 C */
}
/**************************************************************************/
/*!
@brief Gets the temperature as a standard sensor event
@param event Sensor event object that will be populated
@returns True
*/
/**************************************************************************/
bool Adafruit_BME280_Temp::getEvent(sensors_event_t *event) {
/* Clear the event */
memset(event, 0, sizeof(sensors_event_t));
event->version = sizeof(sensors_event_t);
event->sensor_id = _sensorID;
event->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
event->timestamp = millis();
event->temperature = _theBME280->readTemperature();
return true;
}
/**************************************************************************/
/*!
@brief Gets the sensor_t data for the BME280's pressure sensor
*/
/**************************************************************************/
void Adafruit_BME280_Pressure::getSensor(sensor_t *sensor) {
/* Clear the sensor_t object */
memset(sensor, 0, sizeof(sensor_t));
/* Insert the sensor name in the fixed length char array */
strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
sensor->name[sizeof(sensor->name) - 1] = 0;
sensor->version = 1;
sensor->sensor_id = _sensorID;
sensor->type = SENSOR_TYPE_PRESSURE;
sensor->min_delay = 0;
sensor->min_value = 300.0; /* 300 ~ 1100 hPa */
sensor->max_value = 1100.0;
sensor->resolution = 0.012; /* 0.12 hPa relative */
}
/**************************************************************************/
/*!
@brief Gets the pressure as a standard sensor event
@param event Sensor event object that will be populated
@returns True
*/
/**************************************************************************/
bool Adafruit_BME280_Pressure::getEvent(sensors_event_t *event) {
/* Clear the event */
memset(event, 0, sizeof(sensors_event_t));
event->version = sizeof(sensors_event_t);
event->sensor_id = _sensorID;
event->type = SENSOR_TYPE_PRESSURE;
event->timestamp = millis();
event->pressure = _theBME280->readPressure() / 100; // convert Pa to hPa
return true;
}
/**************************************************************************/
/*!
@brief Gets the sensor_t data for the BME280's humidity sensor
*/
/**************************************************************************/
void Adafruit_BME280_Humidity::getSensor(sensor_t *sensor) {
/* Clear the sensor_t object */
memset(sensor, 0, sizeof(sensor_t));
/* Insert the sensor name in the fixed length char array */
strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
sensor->name[sizeof(sensor->name) - 1] = 0;
sensor->version = 1;
sensor->sensor_id = _sensorID;
sensor->type = SENSOR_TYPE_RELATIVE_HUMIDITY;
sensor->min_delay = 0;
sensor->min_value = 0;
sensor->max_value = 100; /* 0 - 100 % */
sensor->resolution = 3; /* 3% accuracy */
}
/**************************************************************************/
/*!
@brief Gets the humidity as a standard sensor event
@param event Sensor event object that will be populated
@returns True
*/
/**************************************************************************/
bool Adafruit_BME280_Humidity::getEvent(sensors_event_t *event) {
/* Clear the event */
memset(event, 0, sizeof(sensors_event_t));
event->version = sizeof(sensors_event_t);
event->sensor_id = _sensorID;
event->type = SENSOR_TYPE_RELATIVE_HUMIDITY;
event->timestamp = millis();
event->relative_humidity = _theBME280->readHumidity();
return true;
}

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libraries/Adafruit_BME280_Library/Adafruit_BME280.h Normal file
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/*!
* @file Adafruit_BME280.h
*
* 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 and open-source hardware by purchasing
* products from Adafruit!
*
* Written by Kevin "KTOWN" Townsend for Adafruit Industries.
*
* BSD license, all text here must be included in any redistribution.
* See the LICENSE file for details.
*
*/
#ifndef __BME280_H__
#define __BME280_H__
#include "Arduino.h"
#include <Adafruit_I2CDevice.h>
#include <Adafruit_SPIDevice.h>
#include <Adafruit_Sensor.h>
/*!
* @brief default I2C address
*/
#define BME280_ADDRESS (0x77) // Primary I2C Address
/*!
* @brief alternate I2C address
*/
#define BME280_ADDRESS_ALTERNATE (0x76) // Alternate Address
/*!
* @brief Register addresses
*/
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
};
/**************************************************************************/
/*!
@brief calibration data
*/
/**************************************************************************/
typedef struct {
uint16_t dig_T1; ///< temperature compensation value
int16_t dig_T2; ///< temperature compensation value
int16_t dig_T3; ///< temperature compensation value
uint16_t dig_P1; ///< pressure compensation value
int16_t dig_P2; ///< pressure compensation value
int16_t dig_P3; ///< pressure compensation value
int16_t dig_P4; ///< pressure compensation value
int16_t dig_P5; ///< pressure compensation value
int16_t dig_P6; ///< pressure compensation value
int16_t dig_P7; ///< pressure compensation value
int16_t dig_P8; ///< pressure compensation value
int16_t dig_P9; ///< pressure compensation value
uint8_t dig_H1; ///< humidity compensation value
int16_t dig_H2; ///< humidity compensation value
uint8_t dig_H3; ///< humidity compensation value
int16_t dig_H4; ///< humidity compensation value
int16_t dig_H5; ///< humidity compensation value
int8_t dig_H6; ///< humidity compensation value
} bme280_calib_data;
/*=========================================================================*/
class Adafruit_BME280;
/** Adafruit Unified Sensor interface for temperature component of BME280 */
class Adafruit_BME280_Temp : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the temp sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Temp(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/** Adafruit Unified Sensor interface for pressure component of BME280 */
class Adafruit_BME280_Pressure : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the pressure sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Pressure(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/** Adafruit Unified Sensor interface for humidity component of BME280 */
class Adafruit_BME280_Humidity : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the humidity sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Humidity(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/**************************************************************************/
/*!
@brief Class that stores state and functions for interacting with BME280 IC
*/
/**************************************************************************/
class Adafruit_BME280 {
public:
/**************************************************************************/
/*!
@brief sampling rates
*/
/**************************************************************************/
enum sensor_sampling {
SAMPLING_NONE = 0b000,
SAMPLING_X1 = 0b001,
SAMPLING_X2 = 0b010,
SAMPLING_X4 = 0b011,
SAMPLING_X8 = 0b100,
SAMPLING_X16 = 0b101
};
/**************************************************************************/
/*!
@brief power modes
*/
/**************************************************************************/
enum sensor_mode {
MODE_SLEEP = 0b00,
MODE_FORCED = 0b01,
MODE_NORMAL = 0b11
};
/**************************************************************************/
/*!
@brief filter values
*/
/**************************************************************************/
enum sensor_filter {
FILTER_OFF = 0b000,
FILTER_X2 = 0b001,
FILTER_X4 = 0b010,
FILTER_X8 = 0b011,
FILTER_X16 = 0b100
};
/**************************************************************************/
/*!
@brief standby duration 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();
Adafruit_BME280(int8_t cspin, SPIClass *theSPI = &SPI);
Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
~Adafruit_BME280(void);
bool begin(uint8_t addr = BME280_ADDRESS, TwoWire *theWire = &Wire);
bool init();
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);
bool takeForcedMeasurement(void);
float readTemperature(void);
float readPressure(void);
float readHumidity(void);
float readAltitude(float seaLevel);
float seaLevelForAltitude(float altitude, float pressure);
uint32_t sensorID(void);
float getTemperatureCompensation(void);
void setTemperatureCompensation(float);
Adafruit_Sensor *getTemperatureSensor(void);
Adafruit_Sensor *getPressureSensor(void);
Adafruit_Sensor *getHumiditySensor(void);
protected:
Adafruit_I2CDevice *i2c_dev = NULL; ///< Pointer to I2C bus interface
Adafruit_SPIDevice *spi_dev = NULL; ///< Pointer to SPI bus interface
Adafruit_BME280_Temp *temp_sensor = NULL;
//!< Adafruit_Sensor compat temperature sensor component
Adafruit_BME280_Pressure *pressure_sensor = NULL;
//!< Adafruit_Sensor compat pressure sensor component
Adafruit_BME280_Humidity *humidity_sensor = NULL;
//!< Adafruit_Sensor compat humidity sensor component
void readCoefficients(void);
bool isReadingCalibration(void);
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; //!< I2C addr for the TwoWire interface
int32_t _sensorID; //!< ID of the BME Sensor
int32_t t_fine; //!< temperature with high resolution, stored as an attribute
//!< as this is used for temperature compensation reading
//!< humidity and pressure
int32_t t_fine_adjust = 0; //!< add to compensate temp readings and in turn
//!< to pressure and humidity readings
bme280_calib_data _bme280_calib; //!< here calibration data is stored
/**************************************************************************/
/*!
@brief 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; ///< inactive duration (standby time) in normal mode
// filter settings
// 000 = filter off
// 001 = 2x filter
// 010 = 4x filter
// 011 = 8x filter
// 100 and above = 16x filter
unsigned int filter : 3; ///< filter settings
// unused - don't set
unsigned int none : 1; ///< unused - don't set
unsigned int spi3w_en : 1; ///< unused - don't set
/// @return combined config register
unsigned int get() { return (t_sb << 5) | (filter << 2) | spi3w_en; }
};
config _configReg; //!< config register object
/**************************************************************************/
/*!
@brief 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; ///< temperature oversampling
// pressure oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_p : 3; ///< pressure oversampling
// device mode
// 00 = sleep
// 01 or 10 = forced
// 11 = normal
unsigned int mode : 2; ///< device mode
/// @return combined ctrl register
unsigned int get() { return (osrs_t << 5) | (osrs_p << 2) | mode; }
};
ctrl_meas _measReg; //!< measurement register object
/**************************************************************************/
/*!
@brief 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; ///< pressure oversampling
/// @return combined ctrl hum register
unsigned int get() { return (osrs_h); }
};
ctrl_hum _humReg; //!< hum register object
};
#endif

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Copyright (c) 2015, Limor Fried & Kevin Townsend for Adafruit Industries
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Adafruit Industries nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

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# Adafruit BME280 Library [![Build Status](https://github.com/adafruit/Adafruit_BME280_Library/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BME280_Library/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_BME280_Library/html/index.html)
<a href="http://www.adafruit.com/products/2652"><img src="./assets/board.jpg" width="500"/></a>
This is a library for the Adafruit BME280 Humidity, Barometric Pressure + Temp sensor
Designed specifically to work with the Adafruit BME280 Breakout
* http://www.adafruit.com/products/2652
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
# Installation
To install, use the Arduino Library Manager and search for "Adafruit BME280" and install the library.
## Dependencies
* [Adafruit Unified Sensor Driver](https://github.com/adafruit/Adafruit_Sensor)
# Contributing
Contributions are welcome! Please read our [Code of Conduct](https://github.com/adafruit/Adafruit_PM25AQI/blob/master/CODE_OF_CONDUCT.md>)
before contributing to help this project stay welcoming.
## Documentation and doxygen
Documentation is produced by doxygen. Contributions should include documentation for any new code added.
Some examples of how to use doxygen can be found in these guide pages:
https://learn.adafruit.com/the-well-automated-arduino-library/doxygen
https://learn.adafruit.com/the-well-automated-arduino-library/doxygen-tips
## Formatting and clang-format
This library uses [`clang-format`](https://releases.llvm.org/download.html) to standardize the formatting of `.cpp` and `.h` files.
Contributions should be formatted using `clang-format`:
The `-i` flag will make the changes to the file.
```bash
clang-format -i *.cpp *.h
```
If you prefer to make the changes yourself, running `clang-format` without the `-i` flag will print out a formatted version of the file. You can save this to a file and diff it against the original to see the changes.
Note that the formatting output by `clang-format` is what the automated formatting checker will expect. Any diffs from this formatting will result in a failed build until they are addressed. Using the `-i` flag is highly recommended.
### clang-format resources
* [Binary builds and source available on the LLVM downloads page](https://releases.llvm.org/download.html)
* [Documentation and IDE integration](https://clang.llvm.org/docs/ClangFormat.html)
## About this Driver
Written by Ladyada for Adafruit Industries.
BSD license, check license.txt for more information
All text above must be included in any redistribution

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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. The device's I2C address is either 0x76 or 0x77.
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
See the LICENSE file for details.
***************************************************************************/
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
unsigned long delayTime;
void setup() {
Serial.begin(9600);
Serial.println(F("BME280 test"));
if (! bme.begin(0x77, &Wire)) {
Serial.println("Could not find a valid BME280 sensor, check wiring!");
while (1);
}
Serial.println("-- Default Test --");
Serial.println("normal mode, 16x oversampling for all, filter off,");
Serial.println("0.5ms standby period");
delayTime = 5000;
// For more details on the following scenarious, see chapter
// 3.5 "Recommended modes of operation" in the datasheet
/*
// weather monitoring
Serial.println("-- Weather Station Scenario --");
Serial.println("forced mode, 1x temperature / 1x humidity / 1x pressure oversampling,");
Serial.println("filter off");
bme.setSampling(Adafruit_BME280::MODE_FORCED,
Adafruit_BME280::SAMPLING_X1, // temperature
Adafruit_BME280::SAMPLING_X1, // pressure
Adafruit_BME280::SAMPLING_X1, // humidity
Adafruit_BME280::FILTER_OFF );
// suggested rate is 1/60Hz (1m)
delayTime = 60000; // in milliseconds
*/
/*
// humidity sensing
Serial.println("-- Humidity Sensing Scenario --");
Serial.println("forced mode, 1x temperature / 1x humidity / 0x pressure oversampling");
Serial.println("= pressure off, filter off");
bme.setSampling(Adafruit_BME280::MODE_FORCED,
Adafruit_BME280::SAMPLING_X1, // temperature
Adafruit_BME280::SAMPLING_NONE, // pressure
Adafruit_BME280::SAMPLING_X1, // humidity
Adafruit_BME280::FILTER_OFF );
// suggested rate is 1Hz (1s)
delayTime = 1000; // in milliseconds
*/
/*
// indoor navigation
Serial.println("-- Indoor Navigation Scenario --");
Serial.println("normal mode, 16x pressure / 2x temperature / 1x humidity oversampling,");
Serial.println("0.5ms standby period, filter 16x");
bme.setSampling(Adafruit_BME280::MODE_NORMAL,
Adafruit_BME280::SAMPLING_X2, // temperature
Adafruit_BME280::SAMPLING_X16, // pressure
Adafruit_BME280::SAMPLING_X1, // humidity
Adafruit_BME280::FILTER_X16,
Adafruit_BME280::STANDBY_MS_0_5 );
// suggested rate is 25Hz
// 1 + (2 * T_ovs) + (2 * P_ovs + 0.5) + (2 * H_ovs + 0.5)
// T_ovs = 2
// P_ovs = 16
// H_ovs = 1
// = 40ms (25Hz)
// with standby time that should really be 24.16913... Hz
delayTime = 41;
*/
/*
// gaming
Serial.println("-- Gaming Scenario --");
Serial.println("normal mode, 4x pressure / 1x temperature / 0x humidity oversampling,");
Serial.println("= humidity off, 0.5ms standby period, filter 16x");
bme.setSampling(Adafruit_BME280::MODE_NORMAL,
Adafruit_BME280::SAMPLING_X1, // temperature
Adafruit_BME280::SAMPLING_X4, // pressure
Adafruit_BME280::SAMPLING_NONE, // humidity
Adafruit_BME280::FILTER_X16,
Adafruit_BME280::STANDBY_MS_0_5 );
// Suggested rate is 83Hz
// 1 + (2 * T_ovs) + (2 * P_ovs + 0.5)
// T_ovs = 1
// P_ovs = 4
// = 11.5ms + 0.5ms standby
delayTime = 12;
*/
Serial.println();
}
void loop() {
// Only needed in forced mode! In normal mode, you can remove the next line.
bme.takeForcedMeasurement(); // has no effect in normal mode
printValues();
delay(delayTime);
}
void printValues() {
Serial.print("Temperature = ");
Serial.print(bme.readTemperature());
Serial.println(" *C");
Serial.print("Pressure = ");
Serial.print(bme.readPressure() / 100.0F);
Serial.println(" hPa");
Serial.print("Approx. Altitude = ");
Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
Serial.println(" m");
Serial.print("Humidity = ");
Serial.print(bme.readHumidity());
Serial.println(" %");
Serial.println();
}

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/***************************************************************************
This is a library for the BME280 humidity, temperature & pressure sensor
This example shows how to take Sensor Events instead of direct readings
Designed specifically to work with the Adafruit BME280 Breakout
----> http://www.adafruit.com/products/2652
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 and open-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
***************************************************************************/
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BME280.h>
Adafruit_BME280 bme; // use I2C interface
Adafruit_Sensor *bme_temp = bme.getTemperatureSensor();
Adafruit_Sensor *bme_pressure = bme.getPressureSensor();
Adafruit_Sensor *bme_humidity = bme.getHumiditySensor();
void setup() {
Serial.begin(9600);
Serial.println(F("BME280 Sensor event test"));
if (!bme.begin()) {
Serial.println(F("Could not find a valid BME280 sensor, check wiring!"));
while (1) delay(10);
}
bme_temp->printSensorDetails();
bme_pressure->printSensorDetails();
bme_humidity->printSensorDetails();
}
void loop() {
sensors_event_t temp_event, pressure_event, humidity_event;
bme_temp->getEvent(&temp_event);
bme_pressure->getEvent(&pressure_event);
bme_humidity->getEvent(&humidity_event);
Serial.print(F("Temperature = "));
Serial.print(temp_event.temperature);
Serial.println(" *C");
Serial.print(F("Humidity = "));
Serial.print(humidity_event.relative_humidity);
Serial.println(" %");
Serial.print(F("Pressure = "));
Serial.print(pressure_event.pressure);
Serial.println(" hPa");
Serial.println();
delay(1000);
}

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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. The device's I2C address is either 0x76 or 0x77.
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
See the LICENSE file for details.
***************************************************************************/
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
unsigned long delayTime;
void setup() {
Serial.begin(9600);
while(!Serial); // time to get serial running
Serial.println(F("BME280 test"));
unsigned status;
// default settings
status = bme.begin();
// You can also pass in a Wire library object like &Wire2
// status = bme.begin(0x76, &Wire2)
if (!status) {
Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
Serial.print(" ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
Serial.print(" ID of 0x56-0x58 represents a BMP 280,\n");
Serial.print(" ID of 0x60 represents a BME 280.\n");
Serial.print(" ID of 0x61 represents a BME 680.\n");
while (1) delay(10);
}
Serial.println("-- Default Test --");
delayTime = 1000;
Serial.println();
}
void loop() {
printValues();
delay(delayTime);
}
void printValues() {
Serial.print("Temperature = ");
Serial.print(bme.readTemperature());
Serial.println(" °C");
Serial.print("Pressure = ");
Serial.print(bme.readPressure() / 100.0F);
Serial.println(" hPa");
Serial.print("Approx. Altitude = ");
Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
Serial.println(" m");
Serial.print("Humidity = ");
Serial.print(bme.readHumidity());
Serial.println(" %");
Serial.println();
}

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name=Adafruit BME280 Library
version=2.2.4
author=Adafruit
maintainer=Adafruit <info@adafruit.com>
sentence=Arduino library for BME280 sensors.
paragraph=Arduino library for BME280 humidity and pressure sensors.
category=Sensors
url=https://github.com/adafruit/Adafruit_BME280_Library
architectures=*
depends=Adafruit Unified Sensor, Adafruit BusIO