How to pass data from Edit Text Box in GUI to Constant Block in Simulink?

Hi everyone..

I have a GUI and Simulink (from Simmechanics), and I want to import a data from Edit Text Box in GUI to Constant Block in Simulink. But I don't know how to make it. Is there anyone who can help me?

Thankyou for your attention...

Answer 1

[Sachin Ganjare]

Refer below link:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/155265

Hope it helps!!!

[Sachin Ganjare]

Use 'assignin' function in GUI function callback for updating value of variable that is used in constant block.

[Yoga]

Thanks for your fast response. I have tried but still I didn't understand by using workspace. I hope I'll use set_param commands. Maybe you can lead me to the link who show about set_param using and example.

Thank you..

Answer 2

[Azzi Abdelmalek]

c=10
set_param('yourmodelname/Constant','value',num2str(c))

%yourmodelname is your simulink model name

[Yoga]

This is which I wrote at GUI Edit Text Box Callback.

u = get(hObject,'String');

set_param('untitled/Constant','value',num2str(u));

but it doesn't works.. Is there anything wrong?

[Azzi Abdelmalek]

just check if your constant block is named "constant" , if you have many constant blocks, they are named constant, constant1;...

[Yoga]

Oh.. But I only have 1 constant block.

[Yoga]

Ahh I know the problem.. It should be :

u = str2double(get(hObject,'String'));

And now, it works properly. Thank you very much for your helps..

[Azzi Abdelmalek]

I've used it and it works. I can't tell, maybe there are some names which are 'nt correct

[Azzi Abdelmalek]

Is there an error message, or what? also, when you use set_param, your simulink model must be open, or at least must be loaded.

load_system('untitled')

[Yoga]

No,no, It works now. The problem is I did'nt use str2 double, so it should be :

u = str2double(get(hObject,'String'));

Thank you very much for your helps..

[Mina As]

I have sine wave block instead of constant block how can i update the values of amplitude and frequency in gui with simulink?

[CHHLONH Chhith]

@ Azzi Abdelmalek

I used your command:

c=10

set_param('yourmodelname/Constant','value',num2str(c))

but it does not work with step block. Do you know the command for step block. thanks

Answer 3

[el khatabi el mahdi]

hellos everyone . I am now working on a project that is the regulation of the temperautre and humidity with the help of the Arduino + DHT11 sensor and Simulink , I connected a script matlab in series with the Arduino software to extract values humidity and temperature to plots them in a graph. I'd like to display these values in Simulik for the regulation of these values ,I got Many problem at the declaration of set- param function here is the matlab code (exmeple Tepmerature ): global Temp ; Temp(i) = str2num(out(1:4));

   set_param('DHT11SIM/Temperature','value',num2str(Temp))
   set_param('DHT11SIM', 'Temperature', 'update')

subplot(211); plot(Temp,'g'); axis([0,temps,20,50]); title('DHT11 Température'); xlabel('---> temps (secondes)'); ylabel('---> Température'); grid

code simulink:

here is the erruer that always receives: Error using DHT (line 15) Invalid Simulink object name: DHT11SIM/Temperature .

please Help me