To use it as such, you need a USB cable and a 5V power source. In the case of the Arduino Nano, a mini-B USB cable is required. ... You can use a 6V to 20V unregulated external power supply, ...

Arduino R3 DIY benchtop power supply 12:29 pm January 24, 2022 By Julian Horsey If you would like to build your very own benchtop power supply you might be interested in a DIY tutorial for Supplino.

So there’s a chance to control the 5VDC power path remotely through a suitable switching circuitry. However, there’s hardly any option available for on/off control of other 5V and 3.3V power supply ...

Both the Arduino Nano and Uno can be powered via their integrated USB connectors. This automatically supplies regulated 5V power to the board, allowing you to use any USB-supported power source ...