This set up works reliably, counts 1 to >10,000 laps, times to the msec, and all the components are easily available in the UK. My Python code is nothing to be proud of but it works.
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On the ARC Pro power base are two IR sensor pickups for when cars cross it for lap counting. Let's say I had a spare turn lane changer, like C7007 for example, that has a 1/4 straight with two IR sensors. Could I wire the IR sensors from the ARC PRO BASE to the IR sensors in the 1/4 straight...