• Register
1 vote

Problem :

I am beginner to  Arduino Uno. I have very recently installed the new IDE on my Laptop and suddenly I started facing below error if I tried to compile the program. I am using the Arduino Uno for the very first time.

“Avrdude: ser_open(): can't open device "\\.\COM4": access denied”

I am trying very hard to fix above error from past couple of days but still unable to fix it.

Please help me in fixing above error.

8 5 2
3,230 points

1 Answer

1 vote

Solution :

I know the solution for your issue. I also encountered the same issue in recent past. I had the outside cameras attached to my Laptop. So I tried to switch off the external cameras Once my cameras were off my program worked. So it was a camera software that was using my port.

In your case I think you are trying to use the "Eclipse" and "Arduino" simultaneously. Because of this I think your "com4 Port" conflict is happening and as a result the upload was interrupted.

So to fix your issue you need to restart your laptop and after that try to open your "Arduino" first and then try to upload. And do not open your "Eclipse" at the same time.

8 4
5,680 points

Related questions

1 vote
3 answers 802 views
Problem : Currently I am using a Arduino API with the Uno board and it was working fine until few days. Recently I was working with the interrupt timers and somehow my board went into a mode where I am unable to upload the app. I have the app which blinks the LED light. ... ": Access is denied.” I have also tried to reboot my PC but still it is not working for me. How to fix above error?
asked Mar 27 morrisBson 3.2k points
0 votes
1 answer 268 views
Problem : I am currently working with arduino nano and facing following error avrdude: ser_open(): can't open device "\\.\com1": the system cannot find the file specified.
asked Nov 14, 2019 peterlaw 6.9k points
0 votes
1 answer 68 views
Problem: I have basic knowledge of Arduino.If I try to compile my Arduino UNO sketches by using the official latest version of Arduino software on my Windows 7 then I face this error: sketch\sketch_may21a.ino.cpp:1:21: fatal error: Arduino.h: No such file or ... tried many things but unable to fix the above error. I am looking for guidance from an Arduino UNO expert to fix the above error.
asked Aug 28 Raphael Pacheco 4.9k points
0 votes
1 answer 23 views
Problem: I have only basic knowledge in docker. I am trying to follow the online tutorial to create the first docker Image and luckily for me it went successfully. I have successfully logged in into the docker and now I am trying to push the Image into the docker ... type of error. Denied: Requested access to the resource is denied. Can anyone give me a little bit of hint towards fixing problem?
asked Jul 25 Raphael Pacheco 4.9k points