.. _adt7420:
ADT7420: High accuracy digital I2C temperature sensor
#####################################################
Description
***********
This sample application periodically (1Hz) measures the ambient temperature
in degrees Celsius. The result is written to the console.
When configured in trigger mode the update interval is 5 s, and the
sample maintains a |plusminus| 1 |deg| C window around a recent
temperature. As soon as the temperature goes outside the window an
interrupt causes the application to display an event and update the
upper and lower window boundaries.
References
**********
- ADT7420: http://www.analog.com/adt7420
Wiring
*******
This sample uses the ADT7420 sensor controlled using the I2C interface.
Connect Supply: **VDD**, **GND** and Interface: **SDA**, **SCL**
and optionally connect the **INT** to a interrupt capable GPIO.
The supply voltage can be in the 2.7V 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 an ADT7420
sensor. It should work with any platform featuring a I2C peripheral interface.
It does not work on QEMU.
In this example below the :ref:`nrf52_pca10040` board is used.
.. zephyr-app-commands::
:zephyr-app: samples/sensor/adt7420
:board: nrf52_pca10040
:goals: build flash
Sample Output
=============
.. code-block:: console
*** Booting Zephyr OS build zephyr-v2.1.0-538-g12b2ed2cf7c3 ***
device is 0x2000101c, name is ADT7420
[0:00:00.011]: temperature 21.203125 Cel
[0:00:01.015]: temperature 21.171875 Cel
[0:00:02.019]: temperature 21.171875 Cel
[0:00:03.023]: temperature 21.187500 Cel
[0:00:04.027]: temperature 21.140625 Cel
<repeats endlessly>
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