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I primarily time a format of off-road motorcycle racing that is basically time trials. We start riders every 15-seconds and use a cheap countdown clock that automatically refreshes. Sometimes riders take off a bit early (which is allowed) so there will be time left on the clock which needs to be manually reset by a timing official. 

I'm looking for a solution that would automatically reset a start clock with a photo cell reading. Is this possible? 

A bonus would be if the Photo Cells worked as a backup with our MyLaps Orbits timing software. 

Original Post

A photocell works in a similar fashion to touching two wires together or pushing a button. Timers operate on a normally open circuit that closes when the photocell, button, wire touch occurs.

It would depend on the circuitry and programming of your start clock. Is it like a "running race" display with a countdown repeat program?

We normally use this start clock for your application. It is set up to do what you want.

http://phoenix-sports.com/alge_asc3.htm

 

 

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