Arduino Uno code to interface 4 flow meter

Claiming "urgency" is an excellent way to cause people to ignore your posts for a day or two. :face_with_raised_eyebrow:

OP needs to read "how to post code" and then use the edit function (the "pencil" icon) to correct #6 and #7.

And of course, using interrupts is probably a Very Bad Idea. :thinking:

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