Original and the best, The Mega is designed to support more complex projects, in comparison to the UNO board which is more suitable for beginners. It’s perfect for use in 3D printing and robotics based projects. The Arduino Mega 2560 is an update of the previous Mega board. The board can be used both standalone or connected to a PC. Simply connect it to an AC-to-DC adapter or battery, or connect it to your PC using a USB cable.