dialout group and serialport permission

Question

I faced a strange problem today. I can't open my serial port and it says permission denied!! It's strange because I checked and I member of the dialout group! I'm using arduino.

Answer 1

In general it's always helpful to write out all the commands and their results.

For Arduino in particular, what does this command return?

$ ls -l /dev/ttyACM*

If it indicates less permission, you might want to give yourself read and write access, e.g.:

sudo chmod 600 /dev/ttyACM0