Hello everyone, I am a mechanical engineering student, and recently discovered arduino. You can not imagine, how happy I was, that I will not have to buy commercial products to do simple tasks, but actually do it myself, the way I want it to perform. I watched and read a lot of tutorials, and had …

HELP: NE555 and interrupt function

system May 20, 2012, 5:26pm 3

"rpm" really should be qualified "volatile", though it's probably OK with your code as it is now.

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