How do you run a DC motor from an Arduino from the app designer app? I have looked through countless tutorials and none of them work.

classdef teset2 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure  matlab.ui.Figure
        Button    matlab.ui.control.Button
    end

    
    properties (Access = private)
        a
    end
    

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

        % Code that executes after component creation
        function startupFcn(app)
            clear all
            app.a = arduino();
            
        end

        % Button pushed function: Button
        function ButtonPushed(app, event)
           
           writePWMVoltage(app.a,'D6',5)
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [36 399 100 22];

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = teset2

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            % Execute the startup function
            runStartupFcn(app, @startupFcn)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

[Adam Wylie]

Above is my code for the app designer.

Answer 1

[Walter Roberson]

When you clear all, you clear app itself, and nothing after that can work.

The only place you should ever use "clear all" in code is in a small script that is intended to completely reset the state of MATLAB when you switch tasks, a shortcut to closing and reopening MATLAB. If you are not doing the equivalent of quitting MATLAB and restarting then you should not have "clear all"