How to display the current value of a TagetPC-Signal in a numeric edit field (App Designer) and update the value automatically every timestep ?

I tried to display a realtime value of my TargetPC on the app designer by the following code:

% Value changed function: AEditField

function AEditFieldValueChanged(app, event)

A= app.AEditField.Value;

app.AEditField.Value = getsignal(tg,'Path',1)

end

It works, but unfortunately i have to press enter in the EditField to update the value. I just want to display the current realtime value on my GUI.

Answer 1

[Jonas]

Inside the myTimerFcn, write:

app.AEditField.Value = getsignal(tg,'Path',1);

[Heiko]

Thanks again for your help! I forgot to start the timer. Here is my code:

properties (Access = private)
        
	%Timer Object
	myTimer 
end  

methods (Access = private)
        
        function myTimerFcn(app, ~, event)
            
        %Get value for edit field
        tg = slrealtime('TargetPC1'); 
        app.AEditField.Value = getsignal(tg,'Path',1); 
        
	%Start timer (This can be also done with a button callback)
	start(app.myTimer);
    
	end  
end

	% Callbacks that handle component events
    	methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app)
            
                      
            % Create timer object
             app.myTimer = timer(...
            'ExecutionMode', 'fixedRate', ...      % Run timer repeatedly
            'Period', 0.5, ...                     % Period is 0.5 seconds
            'BusyMode', 'queue',...                % Queue timer callbacks when busy
            'TimerFcn', @app.myTimerFcn);          % Callback that runs every period
           
        end   

	% Value changed function: AEditField
        function AEditFieldValueChanged(app, event)
            
        end 
end  

Answer 2

[Jonas]

• You need to create a timer object
• Attach a function call to the timer object
• Put your code to assign the realtime value to the EditField in the function

https://nl.mathworks.com/matlabcentral/answers/297381-how-to-implement-a-timer-in-appdesigner

https://nl.mathworks.com/help/matlab/ref/timer-class.html

https://nl.mathworks.com/help/matlab/creating_guis/wind-speed-gui-in-app-designer.html

[Heiko]

Thanks Jonas for the quick response and the input with the timer object, but I have still some

understanding problems.

I tried to generate my timer like this:

properties (Access = private)

myTimer % Description

end

methods (Access = private)

function myTimerFcn(app,~,~)

???

end

end

methods (Access = private)

% Code that executes after component creation

function startupFcn(app)

% Create timer object

app.myTimer = timer(...

'ExecutionMode', 'fixedRate', ... % Run timer repeatedly

'Period', 1, ... % Period is 1 second

'TimerFcn', @app.myTimerFcn); % Specify callback function

end

...

How to assign my value to the EditField in that function?