i2c-keyboard.
I've been running in to the problem a few times where I wanted to use an array style keypad.
So here's my solution, an attiny 84 based i2c solution
CREDITS
This project was designed by John Spencer
Made at hackmelbourne.org!
SPECIAL THANKS
To the HackMelbourne (CCHS, http://hackmelbourne.org) community of Melbourne, Australia.
To all other open-source developers whose countless hours supported every other aspect of this design.
DISTRIBUTION
The specific terms of distribution of this project are governed by the license referenced below. Please contact the copyright owner if you wish to modify the board for distribution. Please utilize this design for personal or research projects. Please acknowledge all contributors.
LICENSE
Licensed under the TAPR Open Hardware License (www.tapr.org/OHL). A plain text version of this license is included in this directory.
Copyright John Spencer 2016