MAX31865 Platinum RTD Temperature Sensor
The max31865 temperature sensor allows you to use your max31865 RTD
temperature sensor (datasheet
) with ESPHome
As the communication with the MAX31865 is done using SPI, you need to have an spi bus in your configuration with both miso_pin and mosi_pin set.
VINconnects to 5V (3V3will output 3.3V), or directly connect3V3to 3.3V3Vois not used by ESPHomeGNDconnects to groundCLKconnects to the SPI clk_pinSDOconnects to the SPI miso_pinSDIconnects to the SPI mosi_pinCSconnects to a free GPIO pinRDYis not used by ESPHome
# 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 ΩConfiguration 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. - 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 Hzor60 Hz). Defaults to60 Hz. - rtd_wires (Optional, int): The number of RTD wires. Be sure to solder board jumpers to match! Defaults to
4. - 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.