Configure permissions for /dev/ttyUSB0

Question

I'm trying to communicate with an Arduino from Ubuntu 12.04. When plugging in the USB cable, the arduino's serial port occurs as /dev/ttyUSB0. When I try to connect to it using moserial, I'm getting an "Could not open device /dev/ttyUSB0" error, but not when I launch moserial using sudo. What I have to configure to make the serial device accessible as normal non-root user?

Answer 1

You most likely have ConsoleKit running in Ubuntu, which can automatically configure device permissions according to udev rules.

Add the following to /etc/udev/rules.d/60-extra-acl.rules¹:

KERNEL="ttyUSB[0-9]*", TAG+="udev-acl", TAG+="uaccess"

(¹Yes, create the file. It doesn't exist by default.)