The Mega 2560 board has quite a few facilities for communicating with a computer, another board, or other microcontrollers. The ATmega2560 offers four components UARTs for TTL (5V) serial communication. An ATmega16U2 (ATmega 8U2 on the revision 1 and revision 2 boards) to the board channels 1 of these above https://mega2569135.bloginwi.com/61702312/not-known-factual-statements-about-ligamega25