How to change pushbutton colour in Guide without pressing it ?

I have a GUI that reads the DHT11 sensor data attached to Arduino. I also have pushbutton in my GUI. Now, how do I change pushbutton colour based on incoming sensor data. For, example if the temperature is below 30 celsius then pushbutton should turn to Green otherwise it should turn to Red.

[Saad Oussaada]

hello;

please can you share the program with me , I am actuallay stuck , and I don't know what to do

thanks a lot

[Walter Roberson]

What part are you stuck on?

[Saad Oussaada]

well I am not professionel at all in programation on matlab ... and I searshed for a code which can reads data from dht11 and shows it in Spinner on app designer but all i can found is ploting teperature and humidity so I need someone who can help me right the correct program I need this a lot and thank you

[Walter Roberson]

What error message did you receive when you attempted to implement the code? Or what specific function do you need assistance in locating?

[Karthik Muthineni]

Hello Saad Oussaada,

You can create GUI in MATLAB. For that type guide command in command editor, and a window will pop-up. From there you can follow this link to create GUI for your case. You can drag and drop pushbuttons, textarea, axes, and many more widgets. Once you select particular widget you need to assign code for it to do particular task. In your case, if you want to read DHT data and display it on graph you can use this piece of code.

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

delete(instrfind({'Port'},{'COM6'})); % Serial port of your dht microcontroller

s = serial('COM6');

time=1000;

i=1;

while(i<time)

i=i+1;

fopen(s)

fprintf(s, 'Your serial data goes here')

out = fscanf(s)

Temp(i)=str2num(out(1:2));

disp(Temp)

fclose(s)

plot(handles.axes1,Temp)

xlabel('Time (seconds)');

ylabel('Temperature (°C)');

set(handles.text21,'String',num2str(Temp)); % Displays Temperature value in text widget of id 21

drawnow;

end

delete(s)

clear s

if Temp <= 35

set(hObject,'BackgroundColor','green')

else

set(hObject,'BackgroundColor','red')

end

guidata(hObject,handles);

[Saad Oussaada]

hello Karthik Muthineni

thank you so mush

Answer 1

[Karthik Muthineni]

Thank you, Walter, its working.

Answer 2

[Walter Roberson]

You can set the BackgroundColor property of the uicontrol handle

   handles.stop_button.BackgroundColor = [0.8 0 0]   %red