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NANO V3 based on the ATmega328 microcontrollers has a small size and can be used together with model boards for solderless wiring (breadboard).
If you're looking to build a network-connected device with Arduino Nano is the best solution for you!
The Mega Pro Embed CH340G / ATmega2560 board is based on the ATmega2560 microcontroller and the USB-UART adapter CH340. The board is compatible with Arduino Mega 2560.