| .. _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:`nrf52dk_nrf52832` board is used. |
| |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/sensor/adt7420 |
| :board: nrf52dk_nrf52832 |
| :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> |
