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I am going to try and build this one as soon as I learn to solder.
Tell me what ya think....Stroller the olde dude.....lol
I might just have to attempt this! Make is a great site...always something interesting on there!
That is pretty nifty, very DIY. Fair warning about those light sensors though, I found them to be very picky when I tried to make my own sensor line several years ago. It's a case where you'll need a truss over the track with lights shining down on the track. Otherwise the variance in ambient light will play havoc with your sensor.
I think IR or other beam sensors are far more reliable but probably need more circuits or something.
I dig the use of the stop watch though, nice pretty numbers at least.