A library-free implementation of "Elegoo The Most Complete Starter Kit"'s timer creation guide. The original guide can be downloaded here. The timer tutorial is in English/Part 3 Multi-module ...
// This sketch is for Arduino versions 1.0 and later // If you're using an Arduino version older than 1.0, use // the other example code available on the tutorial page.
Over on YouTube [Andrew Neal] has a Function Generator Build for Beginners. As beginner videos go this one is fairly comprehensive. [Andrew] shows us how to build a square-wave generator on a ...