arduino powered frequency counter

In this video we build an Arduino powered frequency counter. We also whip up a 555 based signal generator that makes a 1kHz square wave. The counter works by timing the HIGH and LOW pulses, adding them and dividing by 1000000. Easy right?

555 Timer circuit:
https://www.youtube.com/watch?v=iptQ6kEsrrw

Link to all my sketches:
https://www.dropbox.com/sh/m6c40pu99fqxb5b/AAD1Gzn6F4Hy8v9RrTZSxQyHa?dl=0

petko_k_23