Introduction¶

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

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI¶

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-matrixkeypad

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

sudo pip3 install adafruit-circuitpython-matrixkeypad

To install in a virtual environment in your current project:

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

Usage Example¶

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)

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation¶

For information on building library documentation, please check out this guide.

Table of Contents¶

Examples

Simple test

API Reference

adafruit_matrixkeypad
- Implementation Notes