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Arduino Issue: I cannot run any of my code. 'To create a new connection, clear the existing object.'

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William Rogers
William Rogers on 15 Oct 2020
Commented: Rohan Kale on 16 Oct 2020
I have only just begun to learn how to work with arduinos in matlab. My code will not run past the third line, so here are the first few lines:
clearvars
clear all
ard_UltraS('COM4', 'Mega2560','Libraries','Ultrasonic') = arduino;
Matlab gives an error at the third line:
"MATLAB connection to Mega2560 at COM4 exists in your workspace. To create a new connection, clear the existing object."
I have tried clear all, clearvars, clearing that specific variable, restarting matlab, restarting my computer, and different USB ports. With each of these attempts i get the same error. Is there anything to clear the variable I haven't tried? or some way to make sure that the arduino is disconnected?
  1 Comment
Rohan Kale
Rohan Kale on 16 Oct 2020
Hi William,
The construct of the syntax "ard_UltraS('COM4', 'Mega2560','Libraries','Ultrasonic') = arduino;" is not supported for creating an arduino object.
Please use the following syntax instead:
>> ard_UltraS = arduino('COM4', 'Mega2560','Libraries','Ultrasonic');
or
>> ard_UltraS = arduino;
Refer to the MATLAB documentation page on creating an arduino object.
Hope it helps.

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