ARDUINO MEGA 2560 

The MEGA 2560 is designed for more complex projects. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. This gives your projects plenty of room and opportunities.

Microcontroller	ATmega2560
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limit)	6-20V
Digital I/O Pins	54 (of which 15 provide PWM output)
Analog Input Pins	16
DC Current per I/O Pin	20 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	256 KB of which 8 KB used by bootloader
SRAM	8 KB
EEPROM	4 KB
Clock Speed	16 MHz
LED_BUILTIN	13
Length	101.52 mm
Width	53.3 mm
Weight	37 g

the pin in the schematic:

The pins description:

No.	Pin Number	Pin Description
1	D0 – D53	54 Digital Input / Output Pins.
2	A0 – A15	16 Analog Input / Output Pins.
3	D2 – D13	12 Pulse Width Modulation ( PWM ) Pins.
4	Pin # 0 (RX) , Pin # 1 (TX) Pin # 19 (RX1) , Pin # 18 (TX1) Pin # 17 (RX2) , Pin # 16 (TX2) Pin # 15 (RX3) , Pin # 14 (TX3)	4 Serial Communication Ports (8 Pins).
5	Pin # 50 ( MISO ) Pin # 51 ( MOSI ) Pin # 52 ( SCK ) Pin # 53 ( SS )	SPI Communication Pins.
6	Pin # 20 ( SDA ), Pin # 21 ( SCL )	I2C Communication Pins.
7	Pin # 13	Built-In LED for Testing.

References:

[1] https://store.arduino.cc/usa/arduino-mega-2560-rev3

[2] https://www.theengineeringprojects.com/2018/06/introduction-to-arduino-mega-2560.html

[3] https://arduino.stackexchange.com/questions/51523/mega-i2c-and-interrupts-on-0-1