61 lines
1.8 KiB
ReStructuredText
61 lines
1.8 KiB
ReStructuredText
.. _adt7420:
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ADT7420: High accuracy digital I2C temperature sensor
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#####################################################
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Description
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***********
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This sample application periodically (1Hz) measures the ambient temperature
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in degrees Celsius. The result is written to the console.
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When configured in trigger mode the update interval is 5 s, and the
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sample maintains a |plusminus| 1 |deg| C window around a recent
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temperature. As soon as the temperature goes outside the window an
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interrupt causes the application to display an event and update the
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upper and lower window boundaries.
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References
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**********
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- ADT7420: http://www.analog.com/adt7420
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Wiring
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*******
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This sample uses the ADT7420 sensor controlled using the I2C interface.
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Connect Supply: **VDD**, **GND** and Interface: **SDA**, **SCL**
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and optionally connect the **INT** to a interrupt capable GPIO.
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The supply voltage can be in the 2.7V to 5.5V range.
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Depending on the baseboard used, the **SDA** and **SCL** lines require Pull-Up
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resistors.
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Building and Running
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********************
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This project outputs sensor data to the console. It requires an ADT7420
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sensor. It should work with any platform featuring a I2C peripheral interface.
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It does not work on QEMU.
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In this example below the :ref:`nrf52_pca10040` board is used.
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.. zephyr-app-commands::
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:zephyr-app: samples/sensor/adt7420
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:board: nrf52_pca10040
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:goals: build flash
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Sample Output
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=============
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.. code-block:: console
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*** Booting Zephyr OS build zephyr-v2.1.0-538-g12b2ed2cf7c3 ***
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device is 0x2000101c, name is ADT7420
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[0:00:00.011]: temperature 21.203125 Cel
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[0:00:01.015]: temperature 21.171875 Cel
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[0:00:02.019]: temperature 21.171875 Cel
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[0:00:03.023]: temperature 21.187500 Cel
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[0:00:04.027]: temperature 21.140625 Cel
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<repeats endlessly>
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