A project for HackPrinceton Fall 2013. Demo'd on Nov 10th, 2013.
Blog post:
bonnie-eisenman.tumblr.com/post/66630942173/hackprinceton-fall-2013-piano-stairs
Instructables: http://www.instructables.com/id/Piano-Stairs-with-Arduino-and-Raspberry-Pi/?ALLSTEPS