Go Down

Topic: ''COM4 already in use. Try quiting other program may be using it'' (Read 810 times) previous topic - next topic


Hello Everyone

When I upload the program, it took long first then it says ''COM4 already in use try quiting other program may be using it''. I checked in Device manager it says under Ports (COM & LPT) that COM4 is assigned to Arduino Mega 2560 (COM4). I reconfirmed it by checking in Arduino IDE in Tools menu which says ''Serial Port -> COM4''.
Thats very annoying.
If somebody know the solution kindly let me know.
Thanks for reading my problem.



Don't know, but a "Standard Windows Corrective Manoeuvre" may help.


Worth a try is:

In Windows, navigate: Start -> Right-click on 'Computer' -> Select 'Properties'.  Then select Device manager.

Right-click on 'Universal Serial Bus Controllers' and select 'Scan for hardware changes'

Right-click on 'USB Virtualization' and select 'Scan for hardware changes'

Still in Device Manager, expand 'Mice and other pointing devices' and check for Microsoft Serial Ballpoint.  Sometimes Windows installs a driver for that when you plug in an unrecognized device and causes all sorts of problems.


Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131