:mod:`touchio`
==============

.. py:module:: touchio

.. autoapi-nested-parse::

   Touch related IO

   The `touchio` module contains classes to provide access to touch IO typically
   accelerated by hardware on the onboard microcontroller.

   All classes change hardware state and should be deinitialized when they
   are no longer needed if the program continues after use. To do so, either
   call :py:meth:`!deinit` or use a context manager. See
   :ref:`lifetime-and-contextmanagers` for more info.

   For example::

     import touchio
     from board import *

     touch_pin = touchio.TouchIn(D6)
     print(touch_pin.value)

   This example will initialize the the device, and print the
   :py:data:`~touchio.TouchIn.value`.



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.. py:class:: TouchIn(pin: microcontroller.Pin)

   Read the state of a capacitive touch sensor

   Usage::

      import touchio
      from board import *

      touch = touchio.TouchIn(A1)
      while True:
          if touch.value:
              print("touched!")

   Use the TouchIn on the given pin.

   :param ~microcontroller.Pin pin: the pin to read from

   .. py:attribute:: value
      :annotation: :bool

      Whether the touch pad is being touched or not. (read-only)

      True when `raw_value` > `threshold`.


   .. py:attribute:: raw_value
      :annotation: :int

      The raw touch measurement as an `int`. (read-only)


   .. py:attribute:: threshold
      :annotation: :Optional[int]

      Minimum `raw_value` needed to detect a touch (and for `value` to be `True`).

      When the **TouchIn** object is created, an initial `raw_value` is read from the pin,
      and then `threshold` is set to be 100 + that value.

      You can adjust `threshold` to make the pin more or less sensitive::

        import board
        import touchio

        touch = touchio.TouchIn(board.A1)
        touch.threshold = 7300


   .. py:method:: deinit() -> None

      Deinitialises the TouchIn and releases any hardware resources for reuse.


   .. py:method:: __enter__() -> TouchIn

      No-op used by Context Managers.


   .. py:method:: __exit__() -> None

      Automatically deinitializes the hardware when exiting a context. See
      :ref:`lifetime-and-contextmanagers` for more info.