The Mega 2560 board has a variety of facilities for communicating with a pc, another board, or other microcontrollers. The ATmega2560 supplies 4 hardware UARTs for TTL (5V) serial communication. An ATmega16U2 (ATmega 8U2 to the revision one and revision 2 boards) about the board channels a person of these https://ligamega2536803.laowaiblog.com/27412056/examine-this-report-on-mega25