The Arduino Nano and Uno are equipped with very similar processors (the chip that essentially serves as the brain of the board). The Nano features an ATmega328, while the Uno sports an ATmega328P.

Because of the Nano's small form factor, it doesn't have much space to accommodate a jack. There are, however, still three other ways you can power your Nano: via the USB port, VIN pin, and 5V pin.

Arduino has shrunk the UNO R4 with the Arduino Nano R4 board equipped with the same 48 MHz Renesas RA4M1 32-bit Arm ...