Slow Ride
I set up an Arduino to read the notes on Guitar Hero and flash an LED to that corresponding note.
I used this ambient light sensor, from sparkfun.com to read the changes in value on the screen. When something bright flashes in front of it, the Arduino will turn on an LED for as long as that brightness is there.

Take it one step further and you can have this robot play Guitar Hero for you.
I’d like to see the arduino code,could ya email that?
cauz u see,i wonder how you make it trigger that fast.
thanks
Cool! can you tell me more?
I’ve built a complete bot that senses the notes in the same way, but actually plays the game as well:
http://mechanizedrock.com/
@Jeremy
I thought I had seen this before, but it actually played the game as well like what you were talking about Jeremy
If you need help to get it to play everything else let me know. I have an idea..