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Interrupt-based matrix keypad library for Raspberry Pi

Project Description


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

pip install pad4pi

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


from pad4pi import rpi_gpio

    [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):

# printKey will be called each time a keypad button is pressed

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


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

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