The Champ Timer Photo Finish Output Jack?

[exoray]

Since I don't currently have access to the track I will be using, and I figure someone here might know off the top of their head, and if it's posted here others may find it helpful at some point vs contacting Best Track individually. Does anyone off hand know the protocol/logic that the "photo finish" jack uses on the Champ Timer?

My guess is that it's a simple relay that flips closed for a period of time when the first car passes the finish line, but I could be wrong and it's something else like a high/low voltage change?

I'm building an interface circuit so that I can use that 'photo finish' output to send a hotkey keystroke to OBS to trigger a slow-motion replay, vs doing it manually after every race...

My plan is when that 'photo finish' is triggered, wait for say 2 seconds (so the other cars finish) then send the hotkey keystroke to OBS that will then play the previous 7 or 8 seconds of race video in slow motion and then return to the live main video feed.

[gpraceman]

My understanding is that the first car to cross the finish line is what triggers the photo finish. The timer will accept two parameters that affect the photo finish. They are Trigger Delay and Trigger Duration. My guess is that they use a MOSFET for the triggering.

You can contact eTekGadget to get more info, as they are the ones that provide the electronics for the double sided Champ timer models.

[exoray]

The timer will accept two parameters that affect the photo finish. They are Trigger Delay and Trigger Duration.

Doh... I don't know how I missed that on their timer tutorial as those settings are in the screenshot of the setup software...

You can contact eTekGadget to get more info

I will do that...