How can I run matlab connected to arduino more than once?

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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 ...
  2 个评论
Sumit Banerjee
Sumit Banerjee 2016-5-10
You have to delete the object which you have created. For example, if you have this object arduino_board = arduino(port, board, 'Libraries', 'Servo'); then you have to delete this object in the end of the code, i.e. clear arduino_board; all the objects which you have created like this should be cleared.

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采纳的回答

Esther
Esther 2015-12-21
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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更多回答(2 个)

Sadi Mohammad Rifat
All you have to write a command "clear all" on the first line of your code . That's it.

Sumit Banerjee
Sumit Banerjee 2016-5-10
You have to delete the object which you have created. For example, if you have this object arduino_board = arduino(port, board, 'Libraries', 'Servo'); then you have to delete this object in the end of the code, i.e. clear arduino_board; all the objects which you have created like this should be cleared.

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