Sketch uses 4240 bytes (13%) of program storage space. Maximum is 32256 bytes. Global variables use 95 bytes (4%) of dynamic memory, leaving 1953 bytes for local variables. Maximum is 2048 bytes. avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied Failed uploading: uploading …

Hi @moecat . This "Permission denied" error can occur if your Linux user has not been added to the dialout group . I'll provide instructions you can follow to add your user to this group: Open a command line terminal . Type the following command:sudo usermod -a -G dialout "$USER" Log out of your Li…

The problem is that when I type in the command and press Enter, I get the response : [sudo] password for maurice: . I have no clue about a password for the Terminal. Would it be the same pasword I use to gain access to the PC ? The other thing is, I'm not even sure how to log out and log in to m…

[image] moecat: Would it be the same pasword I use to gain access to the PC ? That is correct. It is your Mint login password. The user must be an admin. [image] moecat: I'm not even sure how to log out and log in to my Linux account. Here is a tutorial for logging out: https://linux…

Good morning, Thanks to your expert advice, I am now up and running. I've been using Linux Mint and Arduino for several years now, but when it comes to the finer points I'm at a loss. Thanks again for your rapid response to my dilemma, and for your precise instructions. Maurice

You are welcome. I'm glad it is working now. Regards, Per

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