Laser Timer

Hi guys,
Was wondering if anybody could help. I'm looking at creating a laser timer using the Arduino board.

The problem that I have is that can't seem to find the right type of laser that I can leave on for long durations ( 3-4 hours).

The idea I had was to get a laser to point as a light sensor to start/stop the timer. I was hoping not to have use another arduino to power the laser..

Any ideas?

Thanks

Can you tell us a bit more about what you want to do?
It may be that there's a better/different way of doing things.

Why do you think you can't leave a laser switched on for extended periods?
CD and DVD players manage quite well in that respect. :smiley:

Don't worry, decided to use the PING Ultrasonic sensor instead..

Must be 'TOP SECRET' :wink: