I just finished my latest hardware project, which I decided to call "Gameduino".
Gameduino is a video game adapter for the Arduino. It handles the
scrolling, sprites, collision detection, and sound. This leaves the
Arduino free to run gameplay and handle whatever controller you can
dream up. The example programs - videos are on each page - give you an
idea of what it can do.http://excamera.com/sphinx/gameduino/
If you're interested in getting a Gameduino, the first production run is on Kickstarter:https://www.kickstarter.com/projects/2084212109/gameduino-an-arduino-game-adapter