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clarify matrix keypad pin requirements (#2694) 

Co-authored-by: Samuel Sieb <samuel@sieb.net>
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Samuel Sieb 2023-02-22 12:43:07 -08:00 committed by GitHub
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components/matrix_keypad.rst
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@ -40,9 +40,10 @@ 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.
matrix lines are connected, in order from top to bottom. These pins need to be output capable.
- **columns** (**Required**, list): A list of :ref:`pins <config-pin_schema>` where the vertical
matrix lines are connected, in order from left to right.
matrix lines are connected, in order from left to right. These pins need to be input capable
with pullups enabled. If there is no internal pullup, then an external one is required.
- **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