I got two keypads
from Jameco.com that I wanted to use with my Raspberry Pi. Turns out it's quite easy, as long as you know what the pinout structure is for the keypad.
This instructable will take you through the steps I had to go through to discover the pinout on my keypads, and how I hooked it up to my Raspberry Pi. I'll include the code I'm currently using to "drive" my keypad, and then offer some "next step" type insights into what can be done better, and what could be done next.
Finally, this instructable will really be a sub-instructable that will be part of something I'm calling Voiceberry Pi.