Your board will automatically receive a regulated 5V supply and power up straight ... making it one of the safest ways to ...

While we’re well into the age of 3.3V logic, there are still an incredible number of boards and hardware ... ESPs directly connected to the 5V pin of an Arduino that still work after months ...

A voltage lower than the required rating might not be enough to produce 5V and ... that your board and circuit are free of such debris before connecting a power supply to your Arduino project.