Raspberry Pi + some LEDs + Adafruit LED Backpack + Java + Pi4J = Fun :) see it in action at https://www.youtube.com/watch?v=0miZit94TEU Links: http://learn.adafruit.com/adafruit-raspberry-pi-educational-linux-distro/ http://jdk8.java.net/fxarmpreview/index.html http://pi4j.com/index.html 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 https://github.com/slintes/RaspiAmpel https://github.com/slintes/RaspiAdafruitLEDBackpack