In this article I will explain how to solve a common error in Arduino:
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avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied |
Background
After a long time without using Arduino I have taken my two boards (original one and the Elegoo) to do some activities with my daughter. I connect them, I’m going to put the blink to see that everything is fine and when I’m going to send it to the board it returns me the well-known error.
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Arduino:1.8.5 (Linux), Tarjeta:"Arduino/Genuino Uno" avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied Problema subiendo a la placa. Visita http://www.arduino.cc/en/Guide/Troubleshooting#upload para sugerencias. |
Both my PC and my laptop have Ubuntu 18.04 installed.
Solution
I start by following the link they suggest. And I follow the steps
In tools / board Arduino/Genuino Uno is marked
In tools / serial port /dev/ttyACM0
and as the documentation suggests in case there are problems with the Drivers and permissions I open the terminal and execute:
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sudo usermod -a -G tty yourUserName sudo usermod -a -G dialout yourUserName |
where yourUserName is your user name 🙂
Now I log out and log in again. And just in case I restart the PC / laptop.
It still doesn’t work and the Arduino documentation doesn’t help anymore. So I have continued searching, in forums and blogs. If at this point it does not work for you and you are like me. Follow the next steps
ls /dev/ttyACM0 returns /dev/ttyACM0
ls -l /dev/ttyACM0 return crw-rw—- 1 root dialout 166, 0 nov 26 16:41 /dev/ttyACM
With this we confirm that the port exists.
We will give permissions and check if our user has the necessary permissions.
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sudo chmod a+rw /dev/ttyACM0 id devuelve 20(dialout) |
And I see that the user is within the dialout group so this part is ok.
What has worked for me has been reinstalling Arduino.
If you check
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which avrdude |
And nothing returns you reinstalling Arduino should be fixed.
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sudo apt install --reinstall arduino |
And if you have not managed to solve the problem, leave me a comment and I will try to help you.
Tool to fix the AVRDUDE problem
There is a script to solve this problem. You can try to see if it helps you. I have not gotten to use it but I leave it because I think it can be a useful resource.
AVRDUDE
I leave some information to better understand what AVRDUDE is. The name comes from AVRDUDE – AVR Downloader / UploaDEr
AVRDUDE is a utility to download/upload/manipulate the ROM and EEPROM contents of AVR microcontrollers using the in-system programming technique (ISP).
https://www.nongnu.org/avrdude/
AVRDUDE was initiated by Brian S. Dean as a private project as a programmer for the Atmel AVR microcontroller series.
You can find the software and much more information on the project website.