RIOT/tests/drivers/bmx280

About

This is a test application for the BME280 and BMP280 sensors. Both can measure pressure and temperature. The BME280 can also measure relative humidity.

Usage

The application will initialize the BME280/BMP280 device and display its calibration coefficients. More information can be found on the [Bosch BME280 website][1], on the [Bosch BMP280 website][2], in the [BME280 datasheet][3] and in the [BMP280 datasheet][4].

Notice that it is necessary to first read the temperature even if only one of the other values (humidity or pressure) is needed. This is described in the above mentioned datasheet.

After initialization, every 2 seconds, the application:

• reads and displays the temperature (d°C);
• reads and displays the pressure (Pa);
• reads and displays the humidity (%rH) (only with bme280);

Overruling default parameters

If your device is at a different I2C address than the default (0x77) you can build the test as follows:

export CFLAGS=-DBMX280_PARAM_I2C_ADDR=0x76
BOARD=sodaq-autonomo make -C tests/drivers/bmx280

By default, the test application is built to use the bme280 module, to build it for the bmp280, add DRIVER=bmp280 to the previous command:

$ DRIVER=bmp280 BOARD=sodaq-autonomo make -C tests/drivers/bmx280

For more information, see the datasheets: [1]: https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/ [2]: https://www.bosch-sensortec.com/products/environmental-sensors/pressure-sensors/pressure-sensors-bmp280-1.html [3]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf [4]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf