.. _matrix_keypad:

Matrix keypad
=============

.. seo::
    :description: Matrix key input panel

The ``matrix_keypad`` component allows you to integrate pads which
have the keys connected at the intersection points of the rows and columns 
of a matrix. 

.. figure:: ../images/matrix_keypad.jpg
    :align: center


Component
---------

.. code-block:: yaml

    # Example configuration entry
    matrix_keypad:
      id: mykeypad
      rows:
        - pin: 21
        - pin: 19
        - pin: 18
        - pin: 5
      columns:
        - pin: 17
        - pin: 16
        - pin: 4
        - pin: 15
      keys: "123A456B789C*0#D"
      has_diodes: false


Configuration variables:

- **id** (*Optional*, :ref:`config-id`): Set the ID of this device for use in lambdas.
- **rows** (**Required**, list): A list of :ref:`pins <config-pin_schema>` where the horrizontal
  matrix lines are connected, in order from top to bottom.
- **columns** (**Required**, list): A list of :ref:`pins <config-pin_schema>` where the vertical
  matrix lines are connected, in order from left to right.
- **keys** (*Optional*, string): The keys present on the matrix, from top left to bottom right, 
  row by row. Required for ``key_collector`` and ``binary_sensor`` (if using key selection).
- **has_diodes** (*Optional*, boolean): For pads where row pins are outputs, and the keys are 
  connected with diodes. Defaults to ``false``.


Binary Sensors
--------------

Individual keys can be added independently to ESPHome as ``binary_sensor``:

.. code-block:: yaml

    # Example configuration entry
    binary_sensor:
      - platform: matrix_keypad
        keypad_id: mykeypad
        id: key4
        row: 1
        col: 0
      - platform: keypad
        id: keyA
        key: A

Configuration variables:

- **keypad_id** (*Optional*, :ref:`config-id`): The ID of the keypad to process keypresses from.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this key for use in lambdas.
- **row** (*Optional*, integer): The row of the key.
- **col** (*Optional*, integer): The column of the key.
- **key** (*Optional*, string): The key from ``keys`` configuration entry above.
- All other options from :ref:`Binary Sensor <config-binary_sensor>`.

Either the ``row`` and ``col`` parameters, or the ``key`` parameter has to be provided.


.. note::

    Automatic handling of multiple keys (e.g. PIN code entry) is possible with the 
    the :ref:`Key Collector <key_collector>` component.

See Also
--------

- :doc:`/components/key_collector`
- :ref:`Binary Sensor <config-binary_sensor>`
- :ghedit:`Edit`