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 2020-10-15
评论： Rohan Kale 2020-10-16
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 个评论
Rohan Kale
Rohan Kale 2020-10-16
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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回答（1 个）

Arun Kumar
Arun Kumar 2020-10-16
Hi Willian,
Please refer the following page for correct syntax of the command.
https://www.mathworks.com/help/supportpkg/arduinoio/ref/arduino.html
Hope this helps!
-Arun

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