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  An old friend ask if a prior project "using USB" would work for a Mud Bog event he had coming up, it would not, however I knew SI/OP can. So I came up with the following, which would handle his needs, then I just had to keep going with more features. He requested only a start and finish line to be logged, the driver just went whenever they were ready. Easy enough to add a staging line and a tree output with a red light for other events which I like, so I did.
Link to code source.

Next step using it for Hot Wheels timing.
Now to find my own paved runway to play on, if you happen to be bored and want to watch some videos:
Stock 1986 Corvette at KilKare drag way.
Why buy SI/OP?