An arduino sketch that can count multiple frequencies. There are no delay statements so it very friendly for state machines.
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multiple_frequency_counter
multiple_frequency_generator
README.md

README.md

Multiple Frequency Counter for Arduino

Ever wanted to measure the frequency of a square wave using an Arduino? There are a couple of good solutions out of there to do this, but not all of them had the capacity to do multiple inputs. I couldn't find this quickly so here is my solution.

Check out the blog post if you want some context.