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[SOLVED] Arduino-Pc interface

gayathrim

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Hello,
im trying to interface my arduino uno with matlab. however, when i try to load my code in IDE software it shows the error
"avrdue:ser_open():cant open device '\\.\COM4":the system cannod find the file specified." this in turn results in the connection error in Matlab "Failed to open the serial port COM4 to communicate wih the board uno. Make sure there is no other MATLAB arduino object for this board."
i checked the device manager for COM4 and updated the driver software as well. also, selected the right board and port in IDE. still, i cant fix the error. Can anyone suggest any method?
 

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