I added two ATMega328P based boards to my project to see if they could work as slaves also, for the third and fourth computers, just in case I wanted to play with the Atmel idea again.

Right now none of the slaves are working yet, but the Teensy 3.1 outputs mouse movement data to the Arduino serial monitor.

It's Alive!

Note: might need V-USB?

New pins:

The boards are from the hack: Badger Hack Workshop