MAX31856 Thermocouple Temperature Sensor

The MAX31856 temperature sensor allows you to use your MAX31856 Thermocouple temperature sensor (datasheet) with ESPHome.

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MAX31856 Sensor. Image by Adafruit

As the communication with the MAX31856 is done using SPI, you need to have an 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 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

  • FLT not used by ESPHome

  • DRDY not used by ESPHome

# Example configuration entry
sensor:
  - platform: max31856
    name: BBQ Temperature
    icon: mdi:hamburger
    cs_pin: GPIOXX

Configuration variables:

  • cs_pin (Required, Pin Schema): The Chip Select pin of the SPI interface.

  • update_interval (Optional, Time): The interval to check the sensor. Defaults to 60s.

  • mains_filter (Optional, string): The mains power frequency to reject (50 Hz or 60 Hz). Defaults to 60 Hz.

  • thermocouple_type (Optional, string): The type of thermocouple used. MAX31856 supports: B, E, J, K, N, R, S, and T . Defaults to K.

  • spi_id (Optional, ID): Manually specify the ID of the SPI Component if you want to use multiple SPI buses.

  • All other options from Sensor.

See Also