zephyr

History

Martí Bolívar 24260e6c3a samples: bme280: enable the appropriate bus by default I personally don't find it very useful to have to maintain prj.conf and prj_spi.conf for this sample. The information we need to make this application "just work" with regards to the bus is available in the devicetree, and Kconfig can now access it using dt_compat_on_bus(). Do so, enabling I2C and SPI appropriately when a sensor of the right type is on either of those buses. If no sensors are enabled, the user gets the build-time error message in main.c about no devices being found. This approach is prone to the "stuck symbol" Kconfig problem covered in our documentation, so a pristine build is necessary to change the default settings from a previous build. Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>		2020-04-14 10:38:10 -05:00
..
boards	samples: bme280: nrf52840 DK: set LSB in i2c addr	2020-04-14 10:38:10 -05:00
src	samples: bme280: update to new DT API	2020-04-14 10:38:10 -05:00
CMakeLists.txt	cmake: use find_package to locate Zephyr	2020-03-27 16:23:46 +01:00
Kconfig	samples: bme280: enable the appropriate bus by default	2020-04-14 10:38:10 -05:00
prj.conf	samples: bme280: enable the appropriate bus by default	2020-04-14 10:38:10 -05:00
README.rst	boards: nrf52840_pca10056: Rename board to nrf52840dk_nrf52840	2020-03-27 09:14:08 +01:00
sample.yaml	boards: nrf52840_pca10056: Rename board to nrf52840dk_nrf52840	2020-03-27 09:14:08 +01:00

README.rst

.. _bme280:

BME280 Humidity and Pressure Sensor
###################################

Overview
********

This sample application periodically reads temperature, pressure and humidity data from
the first available device that implements SENSOR_CHAN_AMBIENT_TEMP, SENSOR_CHAN_PRESS,
and SENSOR_CHAN_HUMIDITY. This sample checks the sensor in polling mode (without
interrupt trigger).

Building and Running
********************

This sample application uses an BME280 sensor connected to a board via I2C.
Connect the sensor pins according to the connection diagram given in the `bme280 datasheet`_
at page 38.


.. zephyr-app-commands::
   :zephyr-app: samples/sensor/bme280
   :board: nrf52840dk_nrf52840
   :goals: flash
   :compact:

Sample Output
=============
To check output of this sample , any serial console program can be used.
This example uses ``picocom`` on the serial port ``/dev/ttyACM0``:

.. code-block:: console

        $ sudo picocom -D /dev/ttyUSB0

.. code-block:: console

        temp: 27.950000; press: 100.571027; humidity: 61.014648
        temp: 27.940000; press: 100.570269; humidity: 61.012695
        temp: 27.950000; press: 100.570695; humidity: 61.002929

.. _bme280 datasheet: https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf