:mod:`analogio`
===============

.. py:module:: analogio

.. autoapi-nested-parse::

   Analog hardware support

   The `analogio` module contains classes to provide access to analog IO
   typically implemented with digital-to-analog (DAC) and analog-to-digital
   (ADC) converters.

   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 analogio
     from board import *

     pin = analogio.AnalogIn(A0)
     print(pin.value)
     pin.deinit()

   This example will initialize the the device, read
   :py:data:`~analogio.AnalogIn.value` and then
   :py:meth:`~analogio.AnalogIn.deinit` the hardware. The last step is optional
   because CircuitPython will do it automatically after the program finishes.



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

   Read analog voltage levels

   Usage::

      import analogio
      from board import *

      adc = analogio.AnalogIn(A1)
      val = adc.value

   Use the AnalogIn on the given pin. The reference voltage varies by
   platform so use ``reference_voltage`` to read the configured setting.

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

   .. py:attribute:: value
      :annotation: :int

      The value on the analog pin between 0 and 65535 inclusive (16-bit). (read-only)

      Even if the underlying analog to digital converter (ADC) is lower
      resolution, the value is 16-bit.


   .. py:attribute:: reference_voltage
      :annotation: :float

      The maximum voltage measurable (also known as the reference voltage) as a
      `float` in Volts.


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

      Turn off the AnalogIn and release the pin for other use.


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

      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.



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

   Output analog values (a specific voltage).

   Example usage::

       import analogio
       from board import *

       dac = analogio.AnalogOut(A2)                # output on pin A2
       dac.value = 32768                           # makes A2 1.65V

   Use the AnalogOut on the given pin.

   :param ~microcontroller.Pin pin: the pin to output to

   .. py:attribute:: value
      :annotation: :int

      The value on the analog pin between 0 and 65535 inclusive (16-bit). (write-only)

      Even if the underlying digital to analog converter (DAC) is lower
      resolution, the value is 16-bit.


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

      Turn off the AnalogOut and release the pin for other use.


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

      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.