First idea implementation; Arduino frequency meter

I know, this idea is far from original, but when you don’t have a standalone frequency meter you must compromise with anything you can come up with. In addition, this is not the best you can get from the arduino for this particular job, but I don’t care if my devices are average, or even below average, as far as I can be proud that they are, from ground up, my ideas.

So here is the code

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