The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 Digital Input/Output Pins of which 15 can be used as PWM Outputs, 16 Analog Inputs, 4 UARTs Hardware Serial Ports, a 16 MHz Crystal Oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
Pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Arduino Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.
Frequently Asked Questions:
- Are these 100% compatible with the "normal" Arduino's?
Yes, they really are 100% completely compatible with "normal" Arduino's. Build quality looks the same and everything (studio, library, tools, etc) just works. You may read the reviews.
- What if I'm still concerned about this being named as "Arduino Compatible"?
If still in doubt, please buy from Arduino's official dealer channels. Yes they are more expensive. We use these internally ourselves for various electronic projects and find them to be 100% decent (again, check reviews). That said, we do not make these and we are providing all the information we know.