MATLAB-Arduino Serial Communication Available Feedback

Hello, I am connecting to Arduino on MATLAB App Designer. ( port=arduino('COM7','Uno','Libraries','Servo'); ) I want to get feedback when it is connected to Arduino so when the connection is complete. For example, when the connection is complete, the Lamp should turn from red to green. How can I do it ?

Thanks...

Answer 1

[Shivam Ahuja]

It is my understanding that you want to establish a connection and you want to get the feedback whether the connection is successful or not. The following solution will help you to achieve this:

1. Create a private property or member variable for App class to denote a connection flag and set it once Arduino object creation is complete.

properties (Access = private)
   IsConnected = false % Initially set to false to denote no connection
end

2. Create the Arduino object in try/catch block and perform digital operation in try/catch itself. If something is wrong with the connection, the Arduino object creation itself will error out and will go to the catch statement and the digital operation will double check the Arduino object connection.

 function ConnectButtonPushed(app, event)
  try
    a = arduino;
    app.IsConnected = true;
    %digital operation
  catch
    app.IsConnected = false;
    %digital operation
  end
end

Refer to the MATLAB App Designer documentation for more information on how to use properties in app class.

https://in.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html?searchHighlight=app%20designer%20properties&s_tid=srchtitle

Answer 2

[Eren GÜVEN]

Thank you so much my friend. The project is running. Here is the project :

    function startupFcn(app)
            clear all;
            delete(instrfindall);
    end

    function ConnectButtonButtonPushed(app, event)
            global port;
            global s;
            port=arduino('COM7','Uno','Libraries','Servo');
            s=servo(port,'D3');
            
            try
            app.IsConnected = true;
            app.ActivityLamp.Color='green';
            %digital operation
            catch
            app.IsConnected = false;
            app.ActivityLamp.Color='red';
            %digital operation
            end
    end

    function DegreeKnobValueChanging(app, event)
            global port;
            global s;
            changingValue = event.Value;
            degree=changingValue/180;
            writePosition(s,degree);
    end

    properties (Access = private)
        IsConnected = false
    end
        
    function CloseButtonPushed(app, event)
            global port;
            clear port;
            app.delete;
            clear all;
            delete(instrfindall);
    end

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