USB problem port map

How do I know which com port maps to my USB port? In the IDE port under tools is grayed out. Why?


Could you take a few moments to READ THIS.
It will help you get the best out of the forum.

This can be difficult as most GENUINE boards can map multiple COM ports to a single USB port.
With clones that can vary slightly.

So there is no single answer for you.

As for items in the IDE being greyed out do you have the correct drivers installed ?

Some simple tips in this list.


These steps may also save you some unnecessary time and effort in the forum.

  • Always provide as much detail as possible to your issue it may be important.

  • If applicable provide your SKETCH inside CODE TAGS ( </> ) or a CREATE share link.

  • If applicable provide a schematic even if hand drawn.

  • Check you have a COMMON GROUND where required.

  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.

  • Try other computers where possible.

  • Try other USB leads where possible.

  • You may not have the correct driver installed. CH340/341 or CP2102

  • There may be a problem with the board check your wiring first.

  • Remove any items connected to pins 0 and 1.

  • Ensure you turn off any additional security / antivirus just to test.

  • There may be a problem with the PC try RESTARTING it.

  • You may be selecting the wrong COM port.

  • Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.

  • Clear your browsers CACHE.

  • Close the IDE before using any other serial programs.

  • Preferably install IDE’s as ADMINISTRATOR or your OS equivalent

Performing the above actions may help resolve your problem without further help.


Thanks for the reply. I installed the driver, rebooted and it worked. Does the comment above about Split and Hijack mean I should have started a new topic/thread?

Yes it does and the first link provides that same information. Might I suggest you go though those points.