MATLAB: How to run matlab connected to arduino more than once

arduinocommunicationMATLABmatlab gui

I have a problem with connecting my arduino uno to matlab.. It actually runs perfectly for the first time but when I run it again it says this (Failed to open serial port COM4 to communicate with Arduino board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting.
.. I'm using this command to connect: a = arduino('com4','uno') ..
If anyone can help here I would appreciate it …

Best Answer

Are you running the connect command
   a = arduino('com4','uno')
a second time while object 'a' still exists in the workspace? You only need to connect once.
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