Introduction
============
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:target: https://docs.circuitpython.org/projects/pcf8574/en/latest/
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:target: https://github.com/adafruit/Adafruit_CircuitPython_PCF8574/actions
:alt: Build Status
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:target: https://github.com/psf/black
:alt: Code Style: Black
Python library for PCF8574 GPIO expander
Dependencies
=============
This driver depends on:
* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
* `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
Please ensure all dependencies are available on the CircuitPython filesystem.
This is easily achieved by downloading
`the Adafruit library and driver bundle <https://circuitpython.org/libraries>`_
or individual libraries can be installed using
`circup <https://github.com/adafruit/circup>`_.
Designed for use with the Adafruit PCF8574 GPIO expander breakout board.
`Purchase one from the Adafruit shop <http://www.adafruit.com/products/5545>`_
Installing from PyPI
=====================
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
PyPI <https://pypi.org/project/adafruit-circuitpython-pcf8574/>`_.
To install for current user:
.. code-block:: shell
pip3 install adafruit-circuitpython-pcf8574
To install system-wide (this may be required in some cases):
.. code-block:: shell
sudo pip3 install adafruit-circuitpython-pcf8574
To install in a virtual environment in your current project:
.. code-block:: shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-pcf8574
Installing to a Connected CircuitPython Device with Circup
==========================================================
Make sure that you have ``circup`` installed in your Python environment.
Install it with the following command if necessary:
.. code-block:: shell
pip3 install circup
With ``circup`` installed and your CircuitPython device connected use the
following command to install:
.. code-block:: shell
circup install adafruit_pcf8574
Or the following command to update an existing version:
.. code-block:: shell
circup update
Usage Example
=============
Example usage of the library can be found in the ``examples/`` folder.
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/pcf8574/en/latest/>`_.
For information on building library documentation, please check out
`this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>`_.
Contributing
============
Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_PCF8574/blob/HEAD/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
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