lamp on off in app designer

hi everyone !! I need a help

I had writen a program in App designer that can turn on or off a lamp with arduino , the probleme is it runs for one time , I want to add a loop but it doesn't work

someone can help me please

this is the program

a = arduino('com8','uno');

b = readDigitalPin(a,'D3');

if b == 1

app.Lamp.Enable = 'on';

else

app.Lamp.Enable = 'off';

end

Answer 1

[Kojiro Saito]

In order to run iteratively, you need to call readDigitalPin in while loop or for loop.

If you want to run specified times, for example, 100 times with an interval of 1 second, add the following in startUpFcn callback.

a = arduino('com8','uno');
iter = 0;
while iter < 100
    b = readDigitalPin(a,'D3');
    if b == 1 
       app.Lamp.Enable = 'on';
      
    else
       app.Lamp.Enable = 'off';
    end
    iter = iter + 1;
    pause(1);
end

Alternatively, you can use timer class.

If you want to run forever, you can use while loop in startUpFcn callback.

a = arduino('com8','uno');
while true
    b = readDigitalPin(a,'D3');
    if b == 1 
       app.Lamp.Enable = 'on';
      
    else
       app.Lamp.Enable = 'off';
    end
    pause(1);
end

You can stop the iteration by Ctrl+C.

[Saad Oussaada]

thank you so much , it is working