Introduction
=============

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This is a library for using the I²C-based LED matrices with the HT16K33 chip.
It supports both 16x8 and 8x8 matrices, as well as 7- and 14-segment displays.

* **Notes**

    #. This library is intended for Adafruit CircuitPython's API.  For a library compatible with MicroPython machine API see this `library <https://github.com/adafruit/micropython-adafruit-ht16k33>`_.

    #. This library does not work with the Trellis 4x4 LED+Keypad board. For that product use: `CircuitPython Trellis Library <https://github.com/adafruit/Adafruit_CircuitPython_Trellis/releases/latest>`_

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://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.

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-ht16k33/>`_. To install for current user:

.. code-block:: shell

    pip3 install adafruit-circuitpython-ht16k33

To install system-wide (this may be required in some cases):

.. code-block:: shell

    sudo pip3 install adafruit-circuitpython-ht16k33

To install in a virtual environment in your current project:

.. code-block:: shell

    mkdir project-name && cd project-name
    python3 -m venv .env
    source .env/bin/activate
    pip3 install adafruit-circuitpython-ht16k33

Usage Example
=============

.. code-block :: python

    # Import all board pins and bus interface.
    import board
    import busio

    # Import the HT16K33 LED matrix module.
    from adafruit_ht16k33 import matrix

    # Create the I2C interface.
    i2c = busio.I2C(board.SCL, board.SDA)

    # Create the matrix class.
    # This creates a 16x8 matrix:
    matrix = matrix.Matrix16x8(i2c)
    # Or this creates a 8x8 matrix:
    #matrix = matrix.Matrix8x8(i2c)
    # Or this creates a 8x8 bicolor matrix:
    #matrix = matrix.Matrix8x8x2
    # Finally you can optionally specify a custom I2C address of the HT16k33 like:
    #matrix = matrix.Matrix16x8(i2c, address=0x70)

    # Clear the matrix.
    matrix.fill(0)

    # Set a pixel in the origin 0,0 position.
    matrix[0, 0] = 1
    # Set a pixel in the middle 8, 4 position.
    matrix[8, 4] = 1
    # Set a pixel in the opposite 15, 7 position.
    matrix[15, 7] = 1
    matrix.show()

    # Change the brightness
    matrix.brightness = 8

    # Set the blink rate
    matrix.blink_rate = 2


Contributing
============

Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_HT16K33/blob/master/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.

Documentation
=============

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>`_.