ikkei 2 Charlieplexing LED 7 LED 8 DP 9 ikkei 3 LED Charlieplexing 2003 7 Web LED 7 8x8 LED Arduino 8x8 LED Web Arduino 8x8 LED ikkei 4 Charlieplexing MAXIM (AN1880) Charlieplexing - Reduced Pin-Count LED Display Multiplexing http://japan.maxim-ic.com/app-notes/index.mvp/id/1880 ikkei 5 LED http://www.maxim-ic.com/images/appnotes/1880/DI217Fig02.gif ikkei 6 DP DP ikkei 7 ikkeiplexing ( Charlieplex