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PMWCS3 Capacitive Soil Moisture and Temperature Sensor

The pmwcs3 sensor platform allows you to use your PMWCS3 (informations) capacitive soil moisture and temperature sensor with ESPHome. The I²C bus is required to be set up in your configuration for this sensor to work. Wiring scheme: red is 3.3V, black & shield is GND, green is SDA and white is SCL. 2.2kOhm resistors are advised to pullup both SDA & SDA lines.

PMWCS3 Capacitive Soil Moisture and Temperature Sensor.
# Example configuration entry
sensor:
  - platform: pmwcs3
    e25:
      name: "pmwcs3 e25"
    ec:
      name: "pmwcs3 ec"
    temperature:
      name: "pmwcs3 temperature"
    vwc:
      name: "pmwcs3 vwc"

Configuration variables

Section titled “Configuration variables”

  • e25 (Optional): Electrical Conductivity, reference at 25°C in dS/m. All options from Sensor.

  • ec (Optional): Electrical Conductivity in mS/m. All options from Sensor.

  • temperature (Optional): Soil temperature in °C. All options from Sensor.

  • vwc (Optional): Volumetric Water Content in cm3cm−3. All options from Sensor.

  • address (Optional, int): Manually specify the I²C address of the sensor. Defaults to 0x63.

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

pmwcs3.air_calibration Action

Section titled “pmwcs3.air_calibration Action”

The pmwcs3 probe can to be calibrated in dry/air conditions. The air calibration is a 30s procedure.

# Example configuration entry
sensor:
  - platform: pmwcs3
    id: pmwcs3_id
    # ...


# in some trigger
on_...:
  - sensor.pmwcs3_id.air_calibration:
      id: pmwcs3_id

Configuration option:

  • id (Required, ID): The ID of the pmwcs3 sensor.

pmwcs3.water_calibration Action

Section titled “pmwcs3.water_calibration Action”

The pmwcs3 probe can to be also calibrated in water saturated conditions. Install the probe into a glass of water. The water calibration is also a 30s procedure.

# Example configuration entry
sensor:
  - platform: pmwcs3
    id: pmwcs3_id
    # ...


# in some trigger
on_...:
  - sensor.pmwcs3_id.water_calibration:
      id: pmwcs3_id

Configuration option:

  • id (Required, ID): The ID of the pmwcs3 sensor.

pmwcs3.new_i2c_address Action

Section titled “pmwcs3.new_i2c_address Action”

A new I2C address can be set (for multi-probes cases for example)

# Example configuration entry
sensor:
  - platform: pmwcs3
    id: pmwcs3_id
    # ...


# in some trigger
on_...:
  - sensor.pmwcs3_id.new_i2c_address:
      id: pmwcs3_id
      address: 0x65

Configuration options:

  • id (Required, ID): The ID of the pmwcs3 sensor.
  • address (Required, int, templatable): New I2C address.

See Also

Section titled “See Also”