June 28, 2013 AT 4:00 am

Python Code for 3×4 Matrix Keypad with Raspberry Pi #piday #raspberrypi @Raspberry_Pi


Chris Crumpacker writes:

Another module of my alarm interface is done. I picked up a 3×4 matrix keypad from Adafruit (http://www.adafruit.com/products/419) But couldn’t find any good python code examples for it’s use. I was able to find a few examples that lead me down the right path in terms of scanning rows first as inputs and then swaping pins to scan the columns. I wrote two libraries, the first just uses 7 of the Raspberry Pi’s GPIO pins then I also wrote one that works for the MCP23008 chip since I’m really in a mode of saving pins when I can 🙂 Then also just wrote a demo script to show calling the libraries and their use.

Here is the code as it stands now, I have some ideas on how to change it to be better but this is fully working for now.

Check out the blog post with source code here!

Featured Adafruit Products


Membrane 3×4 Matrix Keypad + extras – 3×4 – Punch in your secret key into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3×4 grid. It’s made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. (read more)

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