zephyr

History

Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int As both C and C++ standards require applications running under an OS to return 'int', adapt that for Zephyr to align with those standard. This also eliminates errors when building with clang when not using -ffreestanding, and reduces the need for compiler flags to silence warnings for both clang and gcc. Most of these changes were automated using coccinelle with the following script: @@ @@ - void + int main(...) { ... - return; + return 0; ... } Approximately 40 files had to be edited by hand as coccinelle was unable to fix them. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-04-14 07:49:41 +09:00
..
boards	samples: sensors: Remove label property from devicetree overlays	2022-07-19 08:23:35 -05:00
src	samples, tests, boards: Switch main return type from void to int	2023-04-14 07:49:41 +09:00
CMakeLists.txt
prj.conf	sensors: Remove unnecessary Kconfig setting of sensors	2022-07-25 15:18:56 +02:00
README.rst
sample.yaml	tests/samples: use integration_plaforms in more tests/samples	2022-11-29 16:03:23 +01:00
trigger.conf	sensors: Remove unnecessary Kconfig setting of sensors	2022-07-25 15:18:56 +02:00

README.rst

.. _sht3xd:

SHT3XD: High accuracy digital I2C humidity sensor
#################################################

Description
***********

This sample application periodically (2 Hz) measures the ambient
temperature and humidity. The result is written to the console.
Optionally, it also shows how to use the upper threshold triggers.

References
**********

 - `SHT3X-DIS sensor <https://www.sensirion.com/en/environmental-sensors/humidity-sensors/digital-humidity-sensors-for-various-applications/>`_

Wiring
*******

This sample uses the SHT3X_DIS sensor controlled using the I2C interface.
Connect Supply: **VDD**, **GND** and Interface: **SDA**, **SCL**
and optionally connect the **ALERT** to a interrupt capable GPIO.
The supply voltage can be in the 2.15V to 5.5V range.
Depending on the baseboard used, the **SDA** and **SCL** lines require Pull-Up
resistors.

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

This project outputs sensor data to the console. It requires a SHT3XD
sensor. It should work with any platform featuring a I2C peripheral
interface.  It does not work on QEMU.  In this example below the
:ref:`nrf51_ble400` board is used.


.. zephyr-app-commands::
   :zephyr-app: samples/sensor/sht3xd
   :board: nrf51_ble400
   :goals: build flash

Sample Output
=============

.. code-block:: console

   SHT3XD: 19.64 Cel ; 41.96 %RH
   SHT3XD: 19.74 Cel ; 42.06 %RH
   SHT3XD: 19.75 Cel ; 42.08 %RH

<repeats endlessly>