Pyserial couldn't open '/dev/ttyUSB0'

[evenil0206]

I’m trying to communicate with arduino uno board through the serial port. and I found that my python program can’t open the port ‘/dev/ttyUSB0’ but Arduino IDE can access to the port without any error and I complete upload the ino codes. I checked it is attached successfully. I’ve tried several solutions.

I changed the permission of /dev/ttyUSB0. now its permission is 777.
I added my username to dialout group.
I double checked the baudrate 9600.
I executed the python program with sudo command.

tried to find the exact solutions but there was no answer.

here is my program code. I extracted only the part making error messages.

try :
            self.py_serial = serial.Serial(port=ino_port, baudrate=baudrate, timeout=1)
        except Exception as e :
            print('Arduino mediator', e)

and the error messaged is below.

Arduino mediator [Errno 2] could not open port /dev/ttyUBS0: [Errno 2] No such file or directory: ‘/dev/ttyUBS0’

[KevinFFF]

Hi evenil0206,

Are you using the devkit or custom board for Jetson Nano?

@evenil0206

I’m trying to communicate with arduino uno board through the serial port. and I found that my python program can’t open the port ‘/dev/ttyUSB0’

Are you connecting a USB-TTL serial console cable on Jetson Nano(USB side) to Arduino board(UART)?

@evenil0206

Arduino mediator [Errno 2] could not open port /dev/ttyUBS0: [Errno 2] No such file or directory: ‘/dev/ttyUBS0’

Should it be ttyUSB0 rather than ttyUBS0?