I had this UNO boardfor few years, and never had any problem in writing sketches and uploading. Last night I used this to control Servos. Today, I try to run the same sketch and had a comment ' Problem in loading'. I checked the TOOLS to find I have lost the COMM3 port. Can some one help me to guide me to get the COMM3 port back. Thanks
Regards Panch
Most likely you plugged it into a different USB port than you normally use. This will cause a new COM port number to be assigned to the UNO when plugged into that port. If you plug it in, what shows up in your "Device Manager" window?