Sources for a Raspberry Pi running on Java, with some LEDs and an Adafruit LED matrix as output, and an Android phone as input device. Communication from Android to the Pi is done via websocket.

See it in action: http://www.youtube.com/watch?v=g_Mn1BiplmY

Supports scrolling text now, too, see this:

• http://www.youtube.com/watch?v=JQi7WSU2Fak
• https://twitter.com/slintes/status/420916372852318209/photo/1

Another update: added a Leapmotion client (see RLClient directory):

• http://www.youtube.com/watch?v=DRHMy_JaD0A

Some links to used components and software:

Pi OS and LED matrix:

• http://learn.adafruit.com/adafruit-raspberry-pi-educational-linux-distro/
• http://learn.adafruit.com/adafruit-led-backpack/overview
• http://learn.adafruit.com/matrix-7-segment-led-backpack-with-the-raspberry-pi/overview
• https://github.com/adafruit/Adafruit-LED-Backpack-Library
• https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/tree/master/Adafruit_LEDBackpack

Java:

• http://jdk8.java.net/fxarmpreview/index.html
• http://pi4j.com/index.html
• https://github.com/TooTallNate/Java-WebSocket

Android:

• http://actionbarsherlock.com/
• http://androidannotations.org/

My libs for the LEDs and the matrix:

• https://github.com/slintes/RaspiAmpel
• https://github.com/slintes/RaspiAdafruitLEDBackpack