Offered by Autodesk, Tinkercad is a free online platform you can use to build and test out your Arduino circuits. This way, you can start learning ... Uno R3, Nano R3, and Mega 2560 R3.

It’s a significant update. The Arduino UNO and Arduino Mega 2560 update the Duemilanove and Mega respectively. They now use an ATMega8U2 instead of an FTDI USB to serial converter chip.