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I am building a race timer and tree for slot car drag racing. I am using optocoupler modules to read when the car is blocking the sensors at the start of the race.

Carrera Evolution Analog Slot Car Racing Race Track Sets System 1:24 Scale Track and, Carrera Digital 132 Slot Car Racing Race Track Set System 1:24 Scale Track ...

Vintage Tyco 2-in-1 Racing Slot Car Race Track Set NEW Bonus Drag Strip 4 Cars!