Documentation for `kuntze` component (#2411)

components/kuntze.rst

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+Kuntze pool monitor
+===================
+
+.. seo::
+    :description: Instructions for setting up Kuntze pool monitor in ESPHome.
+    :image: kuntze.jpg
+
+The ``kuntze`` component allows you to integrate the Kuntze water measurement 
+instrument in ESPHome. It uses :ref:`UART <uart>` (ModBUS) for communication.
+
+Once configured you can use sensors as described below for your projects.
+
+
+.. figure:: ../images/kuntze.jpg
+    :align: center
+
+    Kuntze Neon® Multi instrument
+
+Overview
+--------
+
+Kuntze devices have an RS485 (ModBUS RTU) communication port. Please see the 
+Kuntze papers for the pinout of the RS485 connector on your unit. ModBUS line
+has to be terminated properly (with a ``120Ω`` resistor), and since this is likely
+your only unit connected to ESPHome, you should activate bus termination in the
+Network menu (this component doesn't support multiple Kuntze devices on the same 
+bus). ModBUS address should remain at factory default value.
+
+The device communicates at ``19200`` baud ``8E1``. To connect to ESPHome, an RS485 
+transceiver is needed. Choose a type which does not need a trigger to send and 
+receive data,  for example:
+
+.. figure:: ../images/rs485.jpg
+
+The controller connects to the UART of the MCU. For ESP32 GPIO `16` to `TXD` and `17` 
+to RXD are the default ones but any other pins can be used as well. 3.3V to VCC and GND to GND.
+
+.. warning::
+
+    If you are using the :doc:`logger` make sure you are not using the same pins for it or otherwise disable the UART 
+    logging with the ``baud_rate: 0`` option.
+
+Component
+---------
+
+A configured modbus component is optional. It will be automatically created.
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    uart:
+      - id: uart_bus
+        tx_pin: GPIO16
+        rx_pin: GPIO17
+        baud_rate: 19600
+        parity: EVEN
+
+    sensor:
+      - platform: kuntze
+        id: my_kuntze
+        ph:
+          id: ph
+        temperature:
+          id: temperature
+
+
+Configuration variables:
+
+- **ph**: Measured pH value
+- **temperature**: Measured temperature value
+- **dis1**: Measured DIS 1 value
+- **dis2**: Measured DIS 2 value
+- **redox**: Measured Redox value
+- **ec**: Measured EC value
+- **oci**: Measured OCI value
+
+
+All sensors are *Optional* and support all other options from :ref:`Sensor <config-sensor>`.
+
+See Also
+--------
+
+- :ref:`uart`
+- :doc:`logger`
+- :ref:`Sensor <config-sensor>`
+- `Kuntze manuals <https://www.kuntze.com/en/downloads-2/>`__
+- `Communication protocol <https://www.kuntze.com/wp-content/uploads/2021/05/2019_Manual_Modbus-RTU_ENG.pdf>`__
+- :ghedit:`Edit`