Introduction

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This simple helper library lets you create objects that will scan and detect keypresses on passive matrix keypads

Dependencies

This driver depends on:

• Adafruit CircuitPython <https://github.com/adafruit/circuitpython>_

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-matrixkeypad/>_. To install for current user:

.. code-block:: shell

pip3 install adafruit-circuitpython-matrixkeypad

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

.. code-block:: shell

sudo pip3 install adafruit-circuitpython-matrixkeypad

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-matrixkeypad

Usage Example

.. code-block:: python

import adafruit_matrixkeypad
from digitalio import DigitalInOut
import board

# Classic 3x4 matrix keypad
cols = [DigitalInOut(x) for x in (board.D2, board.D0, board.D4)]
rows = [DigitalInOut(x) for x in (board.D1, board.D6, board.D5, board.D3)]
keys = ((1, 2, 3),
    (4, 5, 6),
    (7, 8, 9),
    ('*', 0, '#'))

keypad = adafruit_matrixkeypad.Matrix_Keypad(rows, cols, keys)

while True:
    keys = keypad.pressed_keys
    if keys:
    print("Pressed: ", keys)
    time.sleep(0.1)

Documentation

API documentation for this library can be found on Read the Docs <https://docs.circuitpython.org/projects/matrixkeypad/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_MatrixKeypad/blob/main/CODE_OF_CONDUCT.md>_ before contributing to help this project stay welcoming.