How do I pass Sensor Data to a GUI?

Hello,

I'm trying to create a GUI that simply plots , or shows in a gauge, what the speed of a Dc motor is. My only problem is that I don't exactly know how to pass it to a GUI function.

So I've created these objects for arduino, the shield library and the dcmotor.

I can set/read the speed, as well as plot it by using a while loop that goes on from 1 -1000, setting axis auto and the drawnow feature.

Now my problem is just doing this in the appdesigner. Now of course a "ValueChangingFcn" should be used, my only problem is passing these parameters to the app designer.

Should I set a property? make a function with the code shown below? start from scratch (i.e uicontrol, uislider..etc..)?

a=arduino('COM4','Uno','Libraries',{'Adafruit/MotorShieldV2','I2C','RotaryEncoder'});
mot=addon(a,'Adafruit/MotorShieldV2');
dcm=dcmotor(mot,1);


%taken from another post, but works well for me
interv=1000;
passo=1;
t=1;
x=0;
while (t<interv)
    b=dcm.Speed;
    x=[x,b];
    plot(x);
    axis auto
    grid on
    t=t+passo;
    drawnow limitrate
end

Answer 1

[Akshay Khadse]

You could directly set the Value property of the Gauge in a MATLAB App. In my opinion, this is the simplest way to pass the data to a GUI designed using MATLAB App Designer.

Assuming that you have a variable named motorSpeed, you can create a simple GUI using MATLAB App Designer named myApp.mlapp as shown below:

This app only has a Guage inside it. The Value property for this Guage is a public property. You just need to have the handle for the app when it is started. Following steps should get you started:

1) Open the app from script or command line using the following command

>> handleApp = myApp

2) Change the Guage Value

>> handleApp.Guage.Value = motorSpeed;

You could do this update whenever you have a new motorSpeed Value.

Please refer the following link to more about sharing data within apps:

https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html