global properties in app designer with arduino

This works:

properties (Access = private)
     s = servo(arduino('com3','uno','Libraries','Servo'),'D5');
     end
     

but not this:

    properties (Access = private)
       bb = arduino('com3','uno','Libraries','Servo');
       s = servo(bb,'D5');  %  s=servo(app.bb,'D5') didn't work either;
    end

why - how - and how to explain this to my students.....?

Is there a better way to have an APP access and run an arduino?

Answer 1

[Mario Malic]

I would suggest you to implement your second code in the startupFcn callback. This is the callback that runs when the app is loaded.

Have your properties block

properties (Access = private)
   bb
   s
end

and startupFcn callback, or make this as a button callback

app.bb = arduino('com3','uno','Libraries','Servo');
app.s = servo(app.bb,'D5')