Com Numbers

I am always getting into a mess attempting to load a sketch onto a board because the com numbers do not correspond. What, in simple terms please am I doing wrong?


You are doing nothing wrong. The assignment of COM ports happens independently in the Operating System. You have to take what it gives you or:

  • Open the Device Manager window
  • Click on Ports (COM & LPT)
  • Click on the line for your Arduino board
  • In the Properties window that opens, click on the Port Settings tab
  • Click on the Advanced button
  • Click on the Com Port Number drop-down
  • Select your desired Com Port provided that it is not already in use
  • Click on OK two times
  • Close the device manager