Avrdude: ser_open can t open device /dev/ttyACM0”: Permission denied Solution

The error message “Avrdude: ser_open can’t open device /dev/ttyACM0: Permission denied” typically occurs when the user running the avrdude command does not have the necessary permissions to access the specified device, /dev/ttyACM0.

Here are a few possible solutions you can try:

1. Run the command with root privileges: Try running the avrdude command with sudo to execute it as the root user. This can be done by prefixing the command with sudo, like this:

sudo chmod a+rw /dev/ttyACM0