:mod:`rotaryio`
===============

.. py:module:: rotaryio

.. autoapi-nested-parse::

   Support for reading rotation sensors

   The `rotaryio` module contains classes to read different rotation encoding schemes. See
   `Wikipedia's Rotary Encoder page <https://en.wikipedia.org/wiki/Rotary_encoder>`_ for more
   background.

   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.



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.. py:class:: IncrementalEncoder(pin_a: microcontroller.Pin, pin_b: microcontroller.Pin, divisor: int = 4)

   IncrementalEncoder determines the relative rotational position based on two series of pulses.

   Create an IncrementalEncoder object associated with the given pins. It tracks the positional
   state of an incremental rotary encoder (also known as a quadrature encoder.) Position is
   relative to the position when the object is contructed.

   :param ~microcontroller.Pin pin_a: First pin to read pulses from.
   :param ~microcontroller.Pin pin_b: Second pin to read pulses from.
   :param int divisor: The divisor of the quadrature signal.

   For example::

     import rotaryio
     import time
     from board import *

     enc = rotaryio.IncrementalEncoder(D1, D2)
     last_position = None
     while True:
         position = enc.position
         if last_position == None or position != last_position:
             print(position)
         last_position = position

   .. py:attribute:: divisor
      :annotation: :int

      The divisor of the quadrature signal.  Use 1 for encoders without
      detents, or encoders with 4 detents per cycle.  Use 2 for encoders with 2
      detents per cycle.  Use 4 for encoders with 1 detent per cycle.


   .. py:attribute:: position
      :annotation: :int

      The current position in terms of pulses. The number of pulses per rotation is defined by the
      specific hardware and by the divisor.


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

      Deinitializes the IncrementalEncoder and releases any hardware resources for reuse.


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

      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.