zephyr

History

Martí Bolívar 06d50c673d samples: bme280: nrf52840 DK: set LSB in i2c addr The nrf52840-DK doesn't have this sensor built-in, so it's likely users will be getting this sensor from a breakout board. The ones that Sparkfun and Adafruit sell pull up the LSB address pin, so the default address is 0x77 on those boards. Let's follow along with them instead of using 0x76, because those are the boards that come up first in the results when you google "BME280 breakout board" from where I'm sitting. 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	coccinelle: standardize k_sleep calls with integer timeouts	2019-10-09 08:38:10 -04:00
CMakeLists.txt	cmake: use find_package to locate Zephyr	2020-03-27 16:23:46 +01:00
Kconfig	samples: bme280: enable sensor logging	2020-04-14 10:38:10 -05:00
prj_spi.conf	samples: bme280: enable sensor logging	2020-04-14 10:38:10 -05:00
prj.conf	samples: bme280: enable sensor logging	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