Quote:
Originally posted by wild03
mirrors? wouldn't you need to split the beam? seems a little hard. I assume you want to wire two photoreceptors in the same line so either could trigger the same timer. If you use two independent laser you'll need to keep the one on the finish line off and once the race starts once the laser at the starting line is crossed you can turn the laser on the finish line on then turn the starting line off...or something like that! tricky! 
Ok I'll give that other thread a try, I was hoping for a centralize website to get the software and details...
Thanks
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No need to split the beam, all you would do is cross the track with it at the start, then reflect it so it runs the length of the track, then goes back across the track again at the finish and into the photoreceptor. Time starts when the beam is broken initially, and the time is displayed when the beam is broken at the finish. It can be the same beam, and preferrably that's the way to do it. On a circuit track, the same beam is used for start and finish, it's the same place. Trust me, there is nothing tricky about this. If you can figure out the actual speed of your Zip based on a 9.35:1 gear ratio, you can build this thing. The thread has everything you need, but if you have any questions let me know.