Scale Speedometer

What is this ? This project is a "real size"  speedometer for miniature trains, cars and anything you wish to measure. It can calculate the speed of the object between 2 measuring points along the track (or road) by counting milliseconds between passages at the  start and end gates.  If you enter the distance between those gates  (in dm) and the used scale  (ex. H0 = 1:87) in to the Arduino, it will calcula ...

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