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TheManualReader

Member

Registered: 2023-03-11

Posts: 2

Arduino sketch upload problem

Good evening, everyone.

After opening Arduino IDE and uploading a sketch - I get the following error:
avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
Failed uploading: uploading error: exit status 1

I fixed this by typing "sudo chmod a+rw /dev/ttyACM0". However, whenever I unplug my USB, then plug it back in and try to upload a sketch - I get the same error again.

I think the problem is that whenever I unplug my USB, the "ttyACM0" file in the /dev/ folder disappears. Does anyone know a way to fix this?

I know this is more of a nuisance than a real problem but it sure would be nice to not have to type "sudo chmod a+rw /dev/ttyACM0" everytime.

obelisk

Member

Registered: 2021-01-10

Posts: 67

Re: Arduino sketch upload problem

Hi,...your post is very long ago. I hope you found the solution. If not this helps me:

I added my username to group "uucp":

gpasswd -a YOURUSERNAME uucp
#(or this next one? I don't know anymore which way I used..)
usermod -a -G uucp

check the vendor and product id of you programming device. For me I have a Usbprog4.0 programmer, which simulates an AVRISP mkII. I created an udev rule:

> cat /etc/udev/rules.d/41-usbprog-avrispmk2.rules 

# AVRISP mkII, Atmel AVR ISP mkII
SUBSYSTEM=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="2104", GROUP="uucp", MODE="0666"

# usbprog firmware-bootloader
ATTRS{idVendor}=="1781", ATTRS{idProduct}=="0c62", GROUP="uucp", MODE="0660"
 
# USBasp programmer
ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05dc", GROUP="uucp", MODE="0660"

 
# USBtiny programmer
ATTRS{idVendor}=="1781", ATTRS{idProduct}=="0c9f", GROUP="uucp", MODE="0660"

After that, restart PC or

udevadm control --reload
udevadm trigger