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Why do you want to use a lightbridge? It is easier ( and more reliable) to use a "optic sensor" like the CNY 37. The distance between the transmitter and the receiver is 3 mm. I use them in mine woodtrack. They cost around €1,50.

I use four sensors. Two for both lanes and two for the pit. The SN7402 is a XOR IC and gives a signal to the computer when a car passes through the pit or crossing the start/finish line.

The rest of the print is based on hardware found on the following site:

T.U.R.M - The Ultimate Race Manager

And I was also inspired by the next site:
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