GUI interface with arduino

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..

[Mohamed Asif]

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

Answer 1

[Jarrod Rivituso]

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.

[Tee]

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)

[Jarrod Rivituso]

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]

hi all .... please i need the correct arduinoIO because iam downloading it but it not woke >>> thanx to all

Answer 2

[Kaustubha Govind]

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);

[Tee]

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

[Kaustubha Govind]

Apparently digitalWrite doesn't like boolean values - you can make that:

a.digitalWrite(10,double(ledValue));

[heisenberg]

how to access serial pins in above program to send data?

Answer 3

[hardik sanghvi]

How to make pause and counter button code