.. zephyr:code-sample:: pressure_interrupt
:name: Barometric pressure and temperature sensor interrupt example
:relevant-api: sensor_interface
Manage interrupts from a barometric pressure and temperature sensor.
Overview
********
This sample application uses a pressure sensor interrupt line to:
* Inform when a measure is available in the sensor FIFO.
Temperature and pressure data are read and displayed in terminal.
If floats are supported, estimated altitude is also displayed.
* Inform when the pressure value crosses a specified threshold.
Threshold corresponds to around a 50cm altitude increase.
A message is displayed in the terminal.
* Inform when the pressure value changed more than the specified
value between two consecutive samples.
Change value corresponds to a finger pressing the sensor.
A message is displayed in the terminal.
Wiring
*******
This sample uses an external breakout for the sensor. A devicetree
overlay must be provided to identify the I2C/SPI bus and GPIO used to
control the sensor.
Building and Running
********************
This sample supports pressure sensor devices. Device needs
to be aliased as ``pressure-sensor``. For example:
.. code-block:: devicetree
/ {
aliases {
pressure-sensor = &icp201xx;
};
};
Make sure the aliases are in devicetree, then build and run with:
.. zephyr-app-commands::
:zephyr-app: samples/sensor/pressure_interrupt
:board: nrf52dk/nrf52832
:goals: build flash
Sample Output
=============
.. code-block:: console
## Default configuration
[00:00:00.266,479] <inf> PRESS_INT_SAMPLE: Starting ICP201xx sample.
[00:00:00.273,803] <inf> PRESS_INT_SAMPLE: temp 25.49 Cel, pressure 96.271438 kPa, altitude 447.208465 m
[00:00:00.280,914] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.271331 kPa, altitude 447.234161 m
[00:00:00.288,024] <inf> PRESS_INT_SAMPLE: temp 25.49 Cel, pressure 96.266685 kPa, altitude 447.636077 m
[00:00:00.295,135] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.267951 kPa, altitude 447.537078 m
[00:00:00.302,246] <inf> PRESS_INT_SAMPLE: temp 25.51 Cel, pressure 96.268577 kPa, altitude 447.488281 m
[00:00:00.309,356] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.269340 kPa, altitude 447.414978 m
[00:00:00.316,467] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.268562 kPa, altitude 447.473663 m
[00:00:00.323,547] <inf> PRESS_INT_SAMPLE: temp 25.50 Cel, pressure 96.267341 kPa, altitude 447.596496 m
<repeats endlessly>
<when sensor is pressed>
[00:00:09.819,061] <inf> PRESS_INT_SAMPLE: PRESSURE CHANGE INTERRUPT
<when the sensor pressure crosses defined threhold>
[00:00:09.859,039] <inf> PRESS_INT_SAMPLE: PRESSURE THRESHOLD INTERRUPT
6560f57140