MATLAB Answers

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

11 views (last 30 days)
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:
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');
>> ard_UltraS = arduino;
Refer to the MATLAB documentation page on creating an arduino object.
Hope it helps.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by