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 ...

An Arduino Nano or a Micro might be the best options If a small board sounds like the most ... one AREF pin, and three power pins (3.3V, 5V, and VIN). Their onboard LEDs are connected to pin ...

[Trent M. Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Ar… ...