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71 lines
2.7 KiB
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71 lines
2.7 KiB
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MAX31865 Platinum RTD Temperature Sensor
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========================================
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.. seo::
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:description: Instructions for setting up MAX31865 platinum RTD temperature sensors.
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:image: max31865.jpg
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The ``max31865`` temperature sensor allows you to use your max31865 RTD
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temperature sensor (`datasheet <https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf>`__) with ESPHome
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.. figure:: images/max31865-full.jpg
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:align: center
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:width: 50.0%
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MAX31865 Sensor. Image by `Adafruit`_
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.. _Adafruit: https://www.adafruit.com/product/3328
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As the communication with the MAX31865 is done using SPI, you need
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to have an :ref:`spi bus <spi>` in your configuration with both **miso_pin** and **mosi_pin** set.
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- ``VIN`` connects to 5V (``3V3`` will output 3.3V), or directly connect ``3V3`` to 3.3V
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- ``GND`` connects to ground
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- ``CLK`` connects to the SPI **clk_pin**
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- ``SDO`` connects to the SPI **miso_pin**
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- ``SDI`` connects to the SPI **mosi_pin**
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- ``CS`` connects to a free GPIO pin
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- ``RDY`` is not used by ESPHome
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.. code:: yaml
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# Example configuration entry
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spi:
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miso_pin: D0
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mosi_pin: D1
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clk_pin: D2
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sensor:
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- platform: max31865
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name: "Living Room Temperature"
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cs_pin: D3
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reference_resistance: 430 Ω
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rtd_nominal_resistance: 100 Ω
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Configuration variables:
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------------------------
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- **name** (**Required**, string): The name for the temperature sensor.
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- **cs_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The Chip Select pin of the SPI interface.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
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- **reference_resistance** (**Required**, float): Reference resistor on the PCB. Adafruit's PT100 (#3328) uses 430 Ω, their PT1000 (#3648) uses 4300 Ω.
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- **rtd_nominal_resistance** (**Required**, float): Nominal resistance of the RTD at 0°C. PT100 is 100 Ω, PT1000 is 1000 Ω.
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- **mains_filter** (*Optional*, string): The mains power frequency to reject (``50 Hz`` or ``60 Hz``). Defaults to ``60 Hz``.
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- **rtd_wires** (*Optional*, int): The number of RTD wires. Be sure to solder board jumpers to match! Defaults to ``4``.
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- **spi_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`SPI Component <spi>` if you want to use multiple SPI buses.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- All other options from :ref:`Sensor <config-sensor>`.
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See Also
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--------
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- :ref:`sensor-filters`
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- :doc:`dallas`
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- :doc:`dht`
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- :doc:`adc`
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- :doc:`max6675`
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- :doc:`max31855`
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- `MAX31865 Library <https://github.com/adafruit/Adafruit_MAX31865>`__ by `Adafruit <https://www.adafruit.com/>`__
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- :apiref:`max31865/max31865.h`
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- :ghedit:`Edit`
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