pad4pi

An interrupt-based Python 2/3 library for reading matrix_ keypad_ key presses using Raspberry Pi GPIO pins.

.. _matrix: http://www.adafruit.com/products/419 .. _keypad: http://www.adafruit.com/products/1824

.. code-block:: python

pip install pad4pi

Tested on a Raspberry Pi B+ using a 4x3 matrix keypad_ but it should work with 4x4 and other sizes.

.. _4x3 matrix keypad: http://www.adafruit.com/products/419

Usage

.. code-block:: python

from pad4pi import rpi_gpio

KEYPAD = [ [1, 2, 3], [4, 5, 6], [7, 8, 9], ["*", 0, "#"] ]

ROW_PINS = [4, 14, 15, 17] # BCM numbering COL_PINS = [18, 27, 22] # BCM numbering

factory = rpi_gpio.KeypadFactory()

Try factory.create_4_by_3_keypad

and factory.create_4_by_4_keypad for reasonable defaults

keypad = factory.create_keypad(keypad=KEYPAD, row_pins=ROW_PINS, col_pins=COL_PINS)

def printKey(key): print(key)

printKey will be called each time a keypad button is pressed

keypad.registerKeyPressHandler(printKey)

When your program exits, call keypad.cleanup() to ensure the Raspberry Pi's GPIO pins are reset.

License

Licensed under GNU Lesser General Public License Version 3_ (LGPL v3).

.. _GNU Lesser General Public License Version 3: https://github.com/brettmclean/pad4pi/blob/master/LICENSE