Rover's note

http://www.raspberrypi.org/camera-board-available-for-sale/

1.sudo raspi-config
2.選『4 Internationalisation Options』
3.選『I3 Change Keyboard Layout』
4.選『一般 101鍵 鍵盤,』
5.選『English (US)』
6.選『鍵盤排列方式的預設值』
7.選『沒有 Compose 鍵』

https://sites.google.com/site/raspberypishare0918/home/di-yi-ci-qi-dong/raspi-config/1-3-1-she-ding-jian-pan

http://blog.gaku.net/gpio-control-on-raspberry-pi-with-ruby/