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 ...

Other than the USB port, there are other ways to power the Arduino Nano. You can use an unregulated external power supply with a rating between 6 and 20 volts, and connect it to the Nano's VIN pin ...

The USB interface is being increasingly used as a power supply and charging port for all ... divider that has a range of up to 6V. An Arduino sketch reads voltage and current data on the analog ...