NANO chip access denied

Development Tools Uploading
1

I am continuing to get this ongoing com problem with my arduino nano. reading " avrdude: ser_open(): can't open device "\.\COM6": Access is denied. Failed uploading: uploading error: exit status 1 " I have tried to update the drivers, uninstalled them and redefine them, changed programmer to Arduinio ISP, and the processor between ATmega328 and the old bootladed. I have no idea whats going wrong because sometimes it will compile an upload but it hardly does.

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Hi @dem123. Are you using an official Nano board? If so, there is a known bug in Arduino IDE 2.x that causes uploads to fail with this "Access is denied" error if you try uploading Arduino IDE Serial Monitor or Serial Plotter is open.

A port can only be used by one process at a time, so Arduino IDE must automatically close the port in Serial Monitor and Serial Plotter during an upload, automatically opening it again after. For some reason, that juggling of the port control is not working with boards that have the FTDI USB chip.

If that bug is the cause of the problem you are having, the workaround will be to manually close the port in Serial Monitor/Serial Plotter before doing an upload. Please give that a try and then let me know if you still have the error while uploading:

Serial Monitor

  1. Click the X icon on the "Serial Monitor" tab in the bottom panel of the Arduino IDE window to close the tab:
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    image405×345 38 KB
  2. Upload the sketch.
  3. Open Serial Monitor again if needed (by clicking the icon on the IDE toolbar or the Tools > Serial Monitor menu item) after the upload is finished.

Serial Plotter

If you have the "Serial Plotter" window open, the procedure is a bit different from closing the Serial Monitor connection:

  1. Close the "Serial Plotter" window.
  2. If the "Serial Monitor" view is not already open, select Tools > Serial Monitor from the Arduino IDE menus to open it.
    ⓘ We must do an open/close cycle on Serial Monitor as a workaround for a bug in Serial Plotter
  3. Click the X icon on the "Serial Monitor" tab in the bottom panel of the Arduino IDE window to close the tab:
    image
    image405×345 38 KB
  4. Upload the sketch.
  5. Open Serial Monitor and/or Serial Plotter again if needed after the upload is finished.

Please let me know if you have any questions or problems while following those instructions.

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Yes it is an Arduino original NANO board. Also i tried doing so and it never ends up uploading forever until it terminates the upload.

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What are any other solutions?

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It is probably caused by this:

Select Tools > Processor > ATmega328P from the Arduino IDE menus and then try uploading again.

Hopefully this time the upload will finish successfully.

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