matrixQPi (Matrix Keypad for Raspberry Pi): a wiringPi based code for reading input from membrane keypad (matrix keypad) comes in 3x4 buttons
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matrixQPi (Matrix Keypad for Raspberry Pi): a WiringPi-Python-based code for reading input from membrane keypad (matrix keypad) comes in 4x3 buttons. is an example that will print pressed-button to stdout

Calling the above script in a bash loop will print pressed-button repetitively: $ while true; do -i; done

It basically reads one pressed key at a time, the above bash loop only repeats the reading

It will print the symbol of the pressed key found from the lookup. In this case the lookup contains symbols from regular phone dial-in key (digits 0, 1,..., 9 plus * and # signs)

As already stated above this requires [WiringPi-Python] 1 installed to the Raspberry Pi as library. However, since this library is already deprecated, you should use [WiringPi-Python@9c77bde] 2 commit. Hence, the library's submodule can't also be used from calling git submodule update --init.

You must copy manually [WiringPi@89bbe97] 3 commit, putting them under WiringPi directory of the WiringPi-Python. Once you have both correct tree from Github, install the working version of this library then using $ sudo python install

This has already tested using Raspberry Pi with Python 2.7.3rc2.

matrixQPi Class

The class provides flexibility to use different matrix keypad size and symbol mapping as well as GPIO pins assigned for reading.

Check on how to use the class in practice. In general you need to define:

  • Button symbol character
  • GPIO used as logical row and column of the matrix