Serial Port Access on Arch

Sat, 30 May 2026 09:35:24 +0100

For access to microcontrollers, such as the ESP32, permissions are required to enable flashing devices etc. If having issues, but seeing the port connected, check the port first (in my example the port was /dev/ttyACM0):

ls -l /dev/ttyACM0
crw-rw---- 1 root uucp 166, 0 May 27 21:05 /dev/ttyACM0

Notice the group uucp has access, we just need to add ourselves to it.

sudo usermod -aG uucp $USER

A restart may be required for this to take effect.

Udev on Notebook

Serial Port Access on Arch