Arduino Uno (COM23)
Serial port 'COM23' already in use. Try quiting any programs that may be using it.
So the board is being recognized. The problem is that some application has the port open and only one program can use the COM port at a time.
Make sure you close any open Serial Monitor or COM port windows. Occasionally, the IDE or other program will leave the COM port open, preventing others from using it. I hate to say it, but sometimes the only remedy is to re-boot.
If that doesn't help, I would suspect that the port is being grabbed at startup by some service. Bluetooth stacks are notorious for monopolizing COM ports. If that is the case, you can try disabling or Re-configuring bluetooth.
It would appear this issue is isolated to one board, my Uno. The Arduino Mega I have works fine and my pic32 starter kit II works fine.
Your board is showing up as a virtual COM port. If it were not working, it would not show up.
If your computer says that the COM port is in use, then the problem is on your computer.
Try re-mapping the Uno to a lower COM port number in Device Manager.
Are you certain?
It's the Arduino IDE that claims this error, and your assessment of the situation is a bit glib.
I've only had 15 years of development experience in the Windows kernel and 4 years with the Arduino, but I am reasonably certain that ...
3. There is no LED "activity", the LED labeled "L" which I believe is attached to pin 13 is at a constant HIGH even when I attempt to download a sketch.
will you still be reasonably certain?
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