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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. Once the car is staged and blocking the sensor I have separate nano that operates a drag racing tree that shows that the car is staged with led lights and drops through three yellow bulbs and then a green one. Each yellow bulb has a 500 millisecond delay and when the bottom yellow bulb lights it has a 500 millisecond delay then it...

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