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+PMWCS3 Capacitive Soil Moisture and Temperature Sensor
+======================================================
+
+.. seo::
+    :description: Instructions for setting up PMWCS3 capacitive soil moisture sensor in ESPHome.
+    :image: pmwcs3.jpg
+    :keywords: PMWCS3
+
+The ``pmwcs3`` sensor platform allows you to use your PMWCS3
+(`informations <https://tinovi.com/wp-content/uploads/2020/01/PM-WCS-3-I2C.pdf>`__)
+capacitive soil moisture and temperature sensor with ESPHome. The :ref:`I²C bus <i2c>` 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.
+
+.. figure:: images/pmwcs3.jpg
+    :align: center
+    :width: 80.0%
+
+    PMWCS3 Capacitive Soil Moisture and Temperature Sensor.
+
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    sensor:
+      - platform: pmwcs3
+        e25:
+          name: "pmwcs3 e25"
+        ec:
+          name: "pmwcs3 ec"
+        temperature:
+          name: "pmwcs3 temperature"
+        vwc:
+          name: "pmwcs3 vwc"
+ 
+Configuration variables:
+------------------------
+
+- **e25** (*Optional*): Electrical Conductivity, reference at 25°C in dS/m. 
+  All options from :ref:`Sensor <config-sensor>`.
+- **ec** (*Optional*): Electrical Conductivity in mS/m. 
+  All options from :ref:`Sensor <config-sensor>`.
+- **temperature** (*Optional*): Soil temperature in °C.
+  All options from :ref:`Sensor <config-sensor>`.
+- **vwc** (*Optional*): Volumetric Water Content in cm3cm−3.
+  All options from :ref:`Sensor <config-sensor>`.
+- **address** (*Optional*, int): Manually specify the I²C address of the sensor.
+  Defaults to ``0x63``.
+- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
+  sensor. Defaults to ``60s``.
+
+.. _sensor-PMWCS3AirCalibrationAction:
+
+``pmwcs3.air_calibration`` Action
+-----------------------------------
+
+The pmwcs3 probe can to be calibrated in dry/air conditions. 
+The air calibration is a 30s procedure.
+
+.. code-block:: yaml
+
+    # 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**, :ref:`config-id`): The ID of the pmwcs3 sensor.
+
+.. _sensor-PMWCS3WaterCalibrationAction:
+
+``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.
+
+.. code-block:: yaml
+
+    # 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**, :ref:`config-id`): The ID of the pmwcs3 sensor.
+
+.. _sensor-PMWCS3NewI2cAddressAction:
+
+``pmwcs3.newi2caddress`` Action
+-----------------------------------
+
+A new I2C address can be set (for multi-probes cases for example)
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    sensor:
+      - platform: pmwcs3
+        id: pmwcs3_id
+        # ...
+
+    # in some trigger
+    on_...:
+      - sensor.pmwcs3_id.newi2caddress:
+          id: pmwcs3_id
+          newaddress: 0x65
+
+Configuration options:
+
+- **id** (**Required**, :ref:`config-id`): The ID of the pmwcs3 sensor.
+- **newaddress** (**Required**, int): New I2C address.
+
+See Also
+--------
+
+- :ref:`sensor-filters`
+- :apiref:`pmwcs3/pmwcs3.h`
+- `Temperature Compensation for Conductivity <https://www.aqion.de/site/112>`__
+- `PMWCS3 Library <https://github.com/tinovi/i2cArduino>`__ by `@tinovi <https://github.com/tinovi>`__
+- :ghedit:`Edit`
diff --git a/images/pmwcs3.jpg b/images/pmwcs3.jpg
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diff --git a/index.rst b/index.rst
index bc7f3bc98..76b675a20 100644
--- a/index.rst
+++ b/index.rst
@@ -311,6 +311,7 @@ Environmental
     MPL3115A2, components/sensor/mpl3115a2, mpl3115a2.jpg, Temperature & Pressure
     MS5611, components/sensor/ms5611, ms5611.jpg, Pressure
     NTC Thermistor, components/sensor/ntc, ntc.jpg, Temperature
+    PMWCS3, components/sensor/pmwcs3, pmwcs3.jpg, Soil moisture & Temperature
     QMP6988, components/sensor/qmp6988, qmp6988_env3.png, Temperature & Pressure
     RadonEye BLE, components/sensor/radon_eye_ble, radon_eye_logo.png, Radon
     RuuviTag, components/sensor/ruuvitag, ruuvitag.jpg, Temperature & Humidity & Accelerometer