The Mega 2560 board has a number of services for speaking with a computer, A different board, or other microcontrollers. The ATmega2560 delivers four hardware UARTs for TTL (5V) serial interaction. An ATmega16U2 (ATmega 8U2 to the revision 1 and revision 2 boards) on the board channels one particular of https://mega2570246.blogzet.com/about-liga-mega25-42653814