[Nicola]

(09-10-2013 12:59 AM)xavi Wrote:  Hello Nicola, welcome to the forum

1.- Cheap solution is to measure first the reaction time on take off, and then measure run:
a) take off: no platform. photocell connected to push button, athlete is with the foot just behind the photocell. When you press the button, athlete see the green light changing on Chronopic, and then he runs. When photocell is touched it ends.
b) run: athlete on contact platform has to run to photocell. (no reaction time).

2.- More expensive solution is to have button and two photocells and measure all together.

In my opinion, solution 1 it's ok.

Cheers.

Thanks for the reply, but I want to know the time that goes by:
1) I press button - lights light up the detachment of the foot off the ground
2) total time from when I press button until you arrive 30 meters barrier or platform
If I'm not mistaken I think the only solution is to have two cronopic.
But my fear is that the athlete must always start with one foot on the platform then the circuit is closed.
From this condition I have to press a button to start.
If I use two cronopic solve the problem? Can you explain how?
thanks