There's the Arduino Giga R1 Wi-Fi featuring an impressive set of 76 pins and the Arduino Mega 2560 with a total ... to more sophisticated devices like an AI-powered robot arm.

the cathodes are attached to the horizontal layers (green wires in the image below – bottom right – shown passing through NPN transistors). The Arduino Mega 2560 R3 is positioned on a ...

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.