App Designer and Arduino
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Hi,
I am designing an interface in the App Designer. I have an Arduino board connected to some sensors. I would like to be able to run the interface multiple times, but right now I run it once perfectly and when I click run again it tells me I have an existing connection at my COM port and I need to clear it. I am unsure how to do this as I am very new to app designer! Any help would be greatly appreciated!
Thanks!
2 Comments
Asad Mirza
on 20 Feb 2019
Mind posting some of app designer code for us?
I suspect what is happening is you're trying to connect to the arduino each time you say click a button to send a signal or something. What you should do instead is connect to the arduino once and then when you click the button to do something have the button code only send a signal rather than try to connect to the arduino.
I'd like to help more but I would need to see the code as it is first.
Accepted Answer
Asad Mirza
on 22 Feb 2019
You could try changing your startup to just this instead.
function startupFcn(app, a)
app.a=arduino(app.port,'uno');
end
Now remove the arduino(app.port,'uno'); line from your RUNButtonPushed(app, event) function.
This way you only create the arduino object once when you startup the app and then after that all you do is send signals with the button. I do not have an arduino nearby to test this on unfortunately.
3 Comments
Asad Mirza
on 26 Feb 2019
Edited: Asad Mirza
on 26 Feb 2019
Attached you'll find a quick app I wrote that first finds all available COM ports. You then select the port your arduino is connected to from the list and then press connect to link it to the arduino. You can edit this app such that now that you've connected to the Arduino separatly you can do all the plotting afterwards.
I suggest you make like a button on the app that now plots data from any of the input arduino pins but only after you've connected. You can use the uibuton enable property to make plotting impossible unless you've already connected to an arduino.
![Arduino_Ex.JPG](https://www.mathworks.com/matlabcentral/answers/uploaded_files/205889/Arduino_Ex.jpeg)
Santiago Restrepo Estrada
on 28 Jun 2019
Hello,
I was wondering how could I integrate this into an existing app.
thank you
More Answers (1)
Kihak Lee
on 28 Dec 2019
Dear Asad Mirza
I tested your attached files(Arduino_Ex.mlapp) several times. There is a problem in disconnect button.
When push disconnect button, error is happend. I can not fix it.
Plese check your code!
thanks
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