.. zephyr:code-sample:: max6675
:name: MAX6675 K-thermocouple to digital converter
:relevant-api: sensor_interface
Get temperature from a MAX6675 K-thermocouple to digital converter (polling
mode).
Overview
********
This is a sample application to read an external MAX6675
cold-junction-compensated K-thermocouple to digital converter.
Requirements
************
- MAX6675 wired to your board SPI bus
- K-thermocouple connected to MAX6675 T+/T- inputs
References
**********
- MAX6675: https://datasheets.maximintegrated.com/en/ds/MAX6675.pdf
Building and Running
********************
This sample can be built with any board that supports SPI. A sample overlay is
provided for the NUCLEO-F030R8 board.
.. zephyr-app-commands::
:zephyr-app: samples/sensor/max6675
:board: nucleo_f030r8
:goals: build
:compact:
Sample Output
=============
The application will read and print sensor temperature every second. Note that
temperature fetch will fail if the K-thermocouple is not connected. This is
because MAX6675 is able to detect if the K-thermocouple is connected or not.
.. code-block:: console
Temperature: 25.25 C
Temperature: 25.50 C
<repeats endlessly every second>
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