If you’re not familiar with the 555 timer, suffice it to say that this versatile ... (click to enlarge) TI’s LMC555 claims to be the smallest and fastest fully-featured 555 available.
If they use an Arduino, it should have been an ATtiny. And of course, if an ATtiny was used, there should have simply been a 555 timer. This time, however, [Tim] decided to actually show how this ...