USB problem and

AT mega 2560 Arduino/Genuino is working only on port 3

I have communicate on port 3 but today the selection is only on port 1 which does not communicate with the arduino board.

please help me to solve this problem.

OS?
Are you asking about fixed port no. assignment?

dx44:
please help me to solve this problem.

Please post your program and give details of what is connected to each serial port on the Mega.

...R

Robin2:
Please post your program and give details of what is connected to each serial port on the Mega.

...R

He's not talking about the serial ports on the Mega.

Apparently, he was using "port3" on his IDE to communicate with the Arduino Mega and now only "port1" appears.

An ambiguous question by the OP leads nowhere.

.

Just guessing ( :wink: ) that port3 actually means COM3.

dx44:
AT mega 2560 Arduino/Genuino is working only on port 3

I have communicate on port 3 but today the selection is only on port 1 which does not communicate with the arduino board.

please help me to solve this problem.

Reboot your computer and then the COM ports will be reset to the way they were.

Paul