All Arduino boards have this pin, and it's connected to the built-in voltage regulator that makes sure your board receives a stable supply. For the Nano, the VIN pin is found on Pin 30 (although ...

You can also monitor serial output using USB and the Arduino IDE. There is a DC power jack which can handle higher voltages from battery packs or an AC/DC converter.

For instance, if I create a square wave that is 5 volts high and I keep it on for 10ms and off for 10ms, the DC voltage measured will be 2.5 volts. Duty cycle is measured as a percentage of on ...