I got this sketch off the internet with a Cut and Paste and I hope I've got the error/code format right. Copied the error message, Code tags etc. The sketch won't verify/compile. The error is something about redefinition of "volatile int rpmcount". There's a reference link to volatile and I've look…

Redifining Volatile Error

dougp November 13, 2017, 1:45pm 8

PaulS:
ONE instance of the interrupt will be queued, not ALL instances.

Thanks for the clarification.

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