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I've got an arduino that I use echo "b" > /dev/ttyUSB0 to send data to it. When this command is run via the root user it works correctly.

However a normal user gets an error of:

echo 'b' >  /dev/ttyUSB0 
zsh: device or resource busy: /dev/ttyUSB0

How can I give a regular user permission for this? 

ls -altr /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Nov 30 22:40 /dev/ttyUSB0

My user is in the dialout group, so they should have permission.

Chris Stryczynski
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  • find whatever else is using `/dev/ttyUSB0` with `fuser` or `lsof`. Uninstall ModemManager (unless you're really using modem-like devices): `apt-get remove modemmanager` –  Dec 01 '19 at 05:05

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