The other is a not connected and is reserved for future purposes. One is the IOREF that allow the shields to adapt to the voltage provided from the board. In addition, there are two new pins placed near the RESET pin. The Mega 2560 R3 also adds SDA and SCL pins next to the AREF. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila. 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. ![]() ![]() It has 54 digital input/output pins (of which 14 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. The Arduino Mega is a microcontroller board based on the ATmega2560. No external programmer is required.Arduino Mega 2560 R3 Board with ATmega2560 - Features Note: The Arduino Mega 2560 does not include a USB cable, batteries, or a DC power adapter. More information about the Arduino Mega 2560 is available on Arduino’s website. See this forum post for more information. Warning: We recommend not connecting the Arduino to USB while it is powered through VIN. *The Arduino Mega 2560 has 70 total available I/O lines all of them can function as digital I/O lines, and sixteen of them can be used as analog inputs.
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