Source: cirosantilli/5v-vs-3-3v
= 5v vs 3.3V
* https://electronics.stackexchange.com/questions/186353/which-is-better-5v-or-3-3v-as-the-supply-voltage#:~:text=3.3V%20has%20a%20lower,ICs%20still%20target%205V%20systems.
* https://forum.arduino.cc/t/5v-vs-3-3v-really-whats-the-difference/648063