У вашего броузера проблема в совместимости с HTML5
Video showing a simple implementation of a Keypad with Arduino. Can be used in projects such as alarm or security systems.
See more on my blog:
http://awesomelectronics.blogspot.com/2011/11/keypad-input-and-processing.html
Download code at:
http://www.box.com/s/i2op0scxlx9xgzntny4v