2013-09-02 Arduino 7 seg LED Computer http://arduino.wiki.fc2.com/wiki/%EF%BC%97%E3%82%BB%E3%82%B0%E6%99%82%E8%A8%88%EF%BC%92 http://www.switch-science.com/catalog/1320/ http://www.switch-science.com/catalog/736/ http://cranberrytree.blogspot.jp/2013/05/arduino47led.html http://www.galileo-7.com/?pid=24791398