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40 lines
1.7 KiB
Markdown
40 lines
1.7 KiB
Markdown
## About
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This is a test application for the BME280 and BMP280 sensors. Both can measure
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pressure and temperature. The BME280 can also measure relative humidity.
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## Usage
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The application will initialize the BME280/BMP280 device and display its
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calibration coefficients. More information can be found on the
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[Bosch BME280 website][1], on the [Bosch BMP280 website][2],
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in the [BME280 datasheet][3] and in the [BMP280 datasheet][4].
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Notice that it is necessary to first read the temperature even if only one
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of the other values (humidity or pressure) is needed. This is described in
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the above mentioned datasheet.
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After initialization, every 2 seconds, the application:
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* reads and displays the temperature (d°C);
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* reads and displays the pressure (Pa);
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* reads and displays the humidity (%rH) (only with bme280);
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## Overruling default parameters
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If your device is at a different I2C address than the default (0x77) you
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can build the test as follows:
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export CFLAGS=-DBMX280_PARAM_I2C_ADDR=0x76
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BOARD=sodaq-autonomo make -C tests/driver_bmx280
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By default, the test application is built to use the bme280 module, to build it for
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the bmp280, add `DRIVER=bmp280` to the previous command:
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$ DRIVER=bmp280 BOARD=sodaq-autonomo make -C tests/driver_bmx280
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For more information, see the datasheets:
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[1]: https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/
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[2]: https://www.bosch-sensortec.com/products/environmental-sensors/pressure-sensors/pressure-sensors-bmp280-1.html
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[3]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
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[4]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf
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