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 ...

"So you are running your void loop() code, where you keep checking forever if some input or signal level or other reading is really necessary.\n", ...

“Arduino Self-Timer” project presented here is a low-component count 60 seconds countdown timer. It can be powered from a 9V compact battery or suitable Arduino AC mains adaptor. Working of the ...