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Tee
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GUI interface with arduino

Asked by Tee
on 24 Mar 2011
Latest activity Commented on by Mohamed Asif on 6 Jul 2017
now, i try to control arduino board through Matlab GUI(using IO packages). First,i try to light on the LED by click on the push button i create, below is the callback function i put:
a=arduino('com3')
a.pinMode(10,'output');
a.digitalWrite(10,1);
after i try it, the LED only blink for a second, but now i wish to light on the LED continuously, what code should i type? I wish to light on and light off the LED using push button i create...anyone can help me, thanks..

  1 Comment

https://in.mathworks.com/videos/arduino-and-matlab-reading-inputs-and-writing-outputs-106502.html
use this above link you can get idea about it

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3 Answers

Answer by Jarrod Rivituso on 24 Mar 2011
 Accepted Answer

Disclaimer - I've used Arduinos in the past, but never used the MATLAB Arduino package.
With that said, I'm not sure if this is your issue, but one thing to consider is whether you want your callback to reinitialize the Arduino pinmode every time.
It seems to me like you'd really want to set up the Arduino pin modes and COM ports in the GUI initialization, and then have your callback only perform the digitalWrite.
If using GUIDE, then you will find a GUI initialization function that you can use to do the initialization. Then, you can use the guidata function to add the Arduino object to the guidata. Something like...
a = arduino('com3');
a.pinMode(10,'output');
handles.a = a;
guidata(hObject, handles);
Then, you could use the handles structure again in your callback
handles.a.digitalWrite(10,ledValue)
Again, this is all assuming you are using GUIDE. If you aren't, then you probably know your GUI's initialization better than I do.

  3 Comments

Tee
on 24 Mar 2011
I'm newbie in Matlab GUI, when i put the code in initialization, it show error too,
Attempting connection ......
Basic I/O Script detected !
Arduino successfully connected !
??? Undefined function or variable 'hObject'.
Error in ==> untitled at 47
guidata(hObject, handles)
Hi Tee,
Are you placing that code in the OpeningFcn?
You may want to have a read through this documentation page, as it discusses data management within a GUI.
http://www.mathworks.com/help/techdoc/creating_guis/f5-998352.html
Other than that, I can't comment more without seeing your code.
Hope this helps!
-Jarrod
medo
on 28 Jul 2014
hi all .... please i need the correct arduinoIO because iam downloading it but it not woke >>> thanx to all

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Answer by Kaustubha Govind on 24 Mar 2011

You could try using a persistent variable to store that last state, and toggle that each time the callback is fired:
persistent ledValue
if isempty(ledValue)
ledValue = 0;
end
ledValue = ~ledValue; %toggle ledValue
a=arduino('com3');
a.pinMode(10,'output');
a.digitalWrite(10,ledValue);

  3 Comments

Tee
on 24 Mar 2011
I'm still a newbie in Matlab GUI, when i run the code in callback function, it show error below :
Attempting connection ......
Basic I/O Script detected !
Arduino successfully connected !
??? Error using ==> arduino>arduino.digitalWrite at 399
The value must be numeric
Error in ==> untitled>lighton_Callback at 95
a.digitalWrite(10,ledValue);
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> untitled at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)untitled('lighton_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback
Apparently digitalWrite doesn't like boolean values - you can make that:
a.digitalWrite(10,double(ledValue));
heisenberg on 18 Mar 2015
how to access serial pins in above program to send data?

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Answer by hardik sanghvi on 25 Nov 2015

How to make pause and counter button code

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