MAX31865 Platinum RTD Temperature Sensor ======================================== .. seo:: :description: Instructions for setting up MAX31865 platinum RTD temperature sensors. :image: max31865.jpg The ``max31865`` temperature sensor allows you to use your max31865 RTD temperature sensor (`datasheet `__) with ESPHome .. figure:: images/max31865-full.jpg :align: center :width: 50.0% MAX31865 Sensor. Image by `Adafruit`_ .. _Adafruit: https://www.adafruit.com/product/3328 As the communication with the MAX31865 is done using SPI, you need to have an :ref:`spi bus ` in your configuration with both **miso_pin** and **mosi_pin** set. - ``VIN`` connects to 5V (``3V3`` will output 3.3V), or directly connect ``3V3`` to 3.3V - ``3Vo`` is not used by ESPHome - ``GND`` connects to ground - ``CLK`` connects to the SPI **clk_pin** - ``SDO`` connects to the SPI **miso_pin** - ``SDI`` connects to the SPI **mosi_pin** - ``CS`` connects to a free GPIO pin - ``RDY`` is not used by ESPHome .. code:: yaml # Example configuration entry spi: miso_pin: D0 mosi_pin: D1 clk_pin: D2 sensor: - platform: max31865 name: "Living Room Temperature" cs_pin: D3 reference_resistance: 430 Ω rtd_nominal_resistance: 100 Ω Configuration variables: ------------------------ - **name** (**Required**, string): The name for the temperature sensor. - **cs_pin** (**Required**, :ref:`Pin Schema `): The Chip Select pin of the SPI interface. - **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``. - **reference_resistance** (**Required**, float): Reference resistor on the PCB. Adafruit's PT100 (#3328) uses 430 Ω, their PT1000 (#3648) uses 4300 Ω. - **rtd_nominal_resistance** (**Required**, float): Nominal resistance of the RTD at 0°C. PT100 is 100 Ω, PT1000 is 1000 Ω. - **mains_filter** (*Optional*, string): The mains power frequency to reject (``50 Hz`` or ``60 Hz``). Defaults to ``60 Hz``. - **rtd_wires** (*Optional*, int): The number of RTD wires. Be sure to solder board jumpers to match! Defaults to ``4``. - **spi_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`SPI Component ` if you want to use multiple SPI buses. - **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation. - All other options from :ref:`Sensor `. See Also -------- - :ref:`sensor-filters` - :doc:`dht` - :doc:`adc` - :doc:`max6675` - :doc:`max31855` - :doc:`max31856` - `MAX31865 Library `__ by `Adafruit `__ - :apiref:`max31865/max31865.h` - :ghedit:`Edit`