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The Arduino Mega 2560 is a microcontroller board based on the ATmega 2560. It also has 54 digital input / output pins, 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power input, an ICSP connection, and a reset button. Contains everything needed to support the microcontroller. Simply connect to a computer with a USB cable or a power source and you're ready to go!
The Arduino Mega 2560 is compatible with most shields designed for the Arduino.
Supply voltage: 5V
Input voltage (recommended): 7-12V
Input voltage (limits): 6-20V
Digital ports: I / O 54 (of which 14 can be PWM outputs)
Analog input ports: 16
Continuous current per port: 40 mA I / O
Continuous current for the door: 3.3V 50 mA
Flash Memory: 256 KB (8KB used in bootloader)
SRAM: 8 KB
Crystal oscillator speed: 16 MHz