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 ...

Arduino, the world's leading ... Arduino Uno - The World's Most ... R3 and 32-bit UNO R4, significant efforts are being made to ensure maximum backward compatibility with existing code examples ...

Arduino has announced the new UNO R4 board family for prototyping and learning. The new models feature a faster microcontroller, a USB-C connector, improved power, Wi-Fi and Bluetooth LE, and more.