esphome-docs/components/sensor/smt100.rst

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SMT100 Soil Moisture Sensor
===========================
.. seo::
:description: Instructions for setting up SMT100 soil moisture and temperature sensor
:image: smt100.jpg
:keywords: smt100
The SMT100 sensor platform allows you to use the SMT100 soil moisture and temperature with ESPHome.
.. figure:: images/smt100.jpg
:align: center
:width: 50.0%
The communication with this component is done via a :ref:`UART <uart>` using a simple ASCII protocol. You must
therefore have a ``uart:`` entry in your configuration with both the TX and RX pins set to some pins on your
board and the baud rate set to 9600.
.. code-block:: yaml
# Example configuration entry
uart:
tx_pin: TX
rx_pin: RX
baud_rate: 9600
sensor:
- platform: smt100
counts:
name: "Counts"
permittivity:
name: "Permittivity"
temperature:
name: "Temperature"
moisture:
name: "Moisture"
voltage:
name: "Voltage"
Configuration variables:
------------------------
- **counts** (*Optional*): Raw measurement data from the sensor electronics (dimensionless quantity). Higher counts mean less moisture. May be used for material specific calibrations.
- **name** (**Required**): Sensor name.
- All other options from :ref:`Sensor <config-sensor>`.
- **dielectric_constant** (*Optional*): Dielectric coefficient or permittivity of the material to be measured (dimensionless quantity). Higher permittivity means higher water content. May be used for material specific calibration.
- **name** (**Required**): Sensor name.
- All other options from :ref:`Sensor <config-sensor>`.
- **temperature** (*Optional*): Soil temperature in degrees Celsius. Please note that the temperature sensor is inside the black sensor enclosure and requires some time to equilibrate with the soil temperature.
- **name** (**Required**): Sensor name.
- All other options from :ref:`Sensor <config-sensor>`.
- **moisture** (*Optional*): Soil moisture (volumetric water content in %).
- **name** (**Required**): Sensor name.
- All other options from :ref:`Sensor <config-sensor>`.
- **voltage** (*Optional*): Supply voltage of the sensor in Volt.
- **name** (**Required**): Sensor name.
- All other options from :ref:`Sensor <config-sensor>`.
- **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`UART Component <uart>` if you want
to use multiple UART buses.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to pull the sensor. Defaults is 60s.
See Also
--------
- :doc:`/components/sensor/smt100`
- :ref:`sensor-filters`
- :apiref:`smt100/smt100.h`
- :ghedit:`Edit`