GUI Timer to Control LabChart 'Realtime' Data collection

Hello,

I'm looking to create a GUI that will allow me to gate when I pull data from an external device called Powerlab. There is currenly some interfacing code HERE which allows for the me to ge data but it is quite clunky. I'm wanting to use a timer function within a GUI to fetch new data on a regular interval, do some math on it and use this data to control another device for a closed-loop application.

When I run my code I get this error particular error (shown directly below) and I'm not really sure what to do about it.

<Error while evaluating TimerFcn for timer 'Reminder'

Undefined function 'updater' for input arguments of type 'timer'.>

I'd appreciate any helpful hints to help solve this issue.

Thanks,

Ryne

classdef SingleChannelGUI < matlab.apps.AppBase
    
    %% Properties that correspond to app components
    properties (Access = public)
    
    %% Empty to limit size of post
    
    end
    
    %% Variables
    properties (Access = public)
    
       %% Empty to limit size of post
    
    end
    
    %% event functions
    methods (Access = private)
        
       %% Removed other functions to limit size of post
        
        function updater(app,varargin)
            gLCDoc.StartSampling(app.wndw)
            plot(gChansData{gChans})             
        end
        
    end
    
    %% App initialization and construction
    methods (Access = private)
        
        % Create UIFigure and components
        function createComponents(app)
            
            %% Empty to limit size of post
            
        end
    end
    
    methods (Access = public)
        
        % Construct app
        function app = SingleChannelGUI
            
            % Create and configure components
            createComponents(app)
            
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            
            if nargout == 0
                clear app
            end
            
            %% Setup Labchart
            global gLCApp;                                                  % defines global gLCApp
            global gChans;                                                  % Array of channel numbers specifying channels to retrieve
            global tmr;                                                     % Global timer for windowing
            global wndw;                                                    % to set the sample window
            wndw = 1;
            GetLCApp;
            gChans = 1;                                                     % collect sampling data from channel 1, call multiple channels like this [1 2]
            doc1   = gLCApp.ActiveDocument;
            RegisterLCEvents(doc1);                        % hook up the OnSelectionChange event and the sampling events such as OnNewSamples and OnBlockStart.
            tmr = timer('Name','Reminder',...
                'Period',wndw,...                                                  % Update the time every 1 second for now
                'StartDelay',0,...                                              % In seconds.
                'TasksToExecute',inf,...                                        % number of times to update
                'ExecutionMode','fixedSpacing',...
                'TimerFcn',{@updater});
            
            doc1   = gLCApp.ActiveDocument;
            RegisterLCEvents(doc1);                        % hook up the OnSelectionChange event and the sampling events such as OnNewSamples and OnBlockStart.
            start(tmr);                                                     % Start the timer object.
        end
        
        %% Code that executes before app deletion
        function delete(app)
            
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
            
            %% Close out Lab Chart connection
            stop(tmr)
            ReleaseLCDoc(doc1); %uncomment this if finished with doc1.
            ReleaseLC();  %uncomment this if finished with gLCApp.
        end
    end
end

[Misha Zahid]

Sir were you able to find a solution to this? I am working on a similar problem and stuck on the same thing as yours.

[per isakson]

See finding the source of an error in a timer code