thanks for the reply ! Do you think that you could help me write the code for it as well ?
I am doing something very similar, measuring the time taken for a car to travel down a track, also reading the speed. I am using two red lasers (IR would be better but much more expensive) and two LDRs.
I can help you with any code you need help with. Are you just wanting to measure the speed or the time taken along a specific part of the track?
You send my the Arduino, the sensors, and the scalextric set. I'll write the code, make sure it all works, and send everything back.
How much will you pay for the code?
;D
Mowcius