MATLAB Answers

Stop data plotting in Matlab App Designer

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Ashleigh Reid
Ashleigh Reid on 23 Jul 2021
Answered: Pavan Guntha on 28 Jul 2021
Hi,
I'm trying to create an Arduino Oscilloscope in app designer, one of my functionalites is to have a 'stop' button so the user can stop the live plot at any time and observe the data. I've tried different ways such as:
fclose(app.s)
Nothing seems to work just yet as the data continues to plot infinitly, any help is appreciated.
properties (Access = private)
%Define Function Variables
s; %serial port
time ; %time of plotting
data = zeros(2,1); %data stored in array
count = 0;
GREEN_COLOR = [0 1 0]
RED_COLOR = [1 0 0]
plotGraph
end
methods (Access = private)
function closeApp_Callback(app, ~, event)
%closeApp_Callback Executes after "Close Confirm" dialog window
% "Close Confirm" dialog window is launched from AppCloseRequest.
switch event.SelectedOption
case 'OK'
% Disconnect from oscilloscope instrument
% (Execute DisconnectButtonPushed callback function)
BConButtonPushed(app,[])
delete(app)
case 'Cancel'
% Continue
end
end
end
% Callbacks that handle component events
methods (Access = private)
% Code that executes after component creation
function startupFcn(app)
% looking for available serial ports
% (Instrument Control Toolbox required)
p = instrhwinfo('serial');
app.PortList.Items = p.AvailableSerialPorts;
end
% Button pushed function: StartPlotButton
function StartPlotButtonPushed(app, event)
app.time =0;
plotGrid = 'on';
max = 300;
min =200;
delay = .01;
%Set up Plot
ax = app.UIAxes;
app.plotGraph = plot(ax, app.time,app.data(1,:),'-r');
hold(app.UIAxes,'on')
plotGraph1 = plot(ax, app.time,app.data(2,:),'-m');
hold(app.UIAxes,'off')
axis(ax, [ 0 10 min max]);
grid(ax, plotGrid);
% start stopwatch timer
tic
%Loop when Plot is Active
while ishandle(app.plotGraph)
%Read Data from Serial as Float
dat = fscanf(app.s,'%f');
if(~isempty(dat) && isfloat(dat)) %Make sure Data Type is Correct
app.count = app.count + 1;
app.time(app.count) = toc; %Extract Elapsed Time in seconds
app.data(:,app.count) = dat(:,1); %Extract 1st Data Element
set(app.plotGraph,'XData',app.time,'YData',app.data(2,:));
set(plotGraph1,'XData',app.time,'YData',app.data(1,:));
axis(ax,[0 app.time(app.count) min max]);
%Allow MATLAB to Update Plot
pause(delay);
end
end
end
% Button pushed function: SaveDataButton
function SaveDataButtonPushed(app, event)
t = table(app.data);
writetable(t,"test.xlsx","Sheet",1);
end
% Button pushed function: StopButton
function StopButtonPushed(app, event)
if app.time.running == "on"
stop(app.time);
stopasync(app.s)
fclose(app.s);
end
end
% Close request function: UIFigure
function UIFigureCloseRequest(app, event)
question = 'Close app?';
uiconfirm(app.UIFigure, question, 'Confirm Close',...
'CloseFcn',@(src,event) closeApp_Callback(app,src,event));
end
% Button pushed function: BCon
function BConButtonPushed(app, event)
% if strcmp(app.time.running, 'off')
app.s = serial(app.PortList.Value);
fopen(app.s);
% start(app.time);
app.ConnLamp.Color = app.GREEN_COLOR;
% end
end
% Button pushed function: BDiscon
function BDisconButtonPushed(app, event)
if app.time.running == "on"
stop(app.t);
if ~app.data
stopasync(app.s)
fclose(app.s);
end
app.Lamp.Color = app.RED_COLOR;
end
app.ConnLamp.Color = app.RED_COLOR;
end
% Button pushed function: Refresh
function RefreshButtonPushed(app, event)
% delete all serial port objets from MATLAB memory
% (Instrument Control Toolbox required)
delete(instrfind);
% looking for available serial ports
% (Instrument Control Toolbox required)
p = instrhwinfo('serial');
app.PortList.Items = p.AvailableSerialPorts;
end
% Button pushed function: ResetButton
function ResetButtonPushed(app, event)
cla(app.UIAxes)
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 1255 764];
app.UIFigure.Name = 'MATLAB App';
app.UIFigure.CloseRequestFcn = createCallbackFcn(app, @UIFigureCloseRequest, true);
% Create Panel
app.Panel = uipanel(app.UIFigure);
app.Panel.Title = 'Panel';
app.Panel.Position = [2 2 546 763];
% Create HardwarePanel
app.HardwarePanel = uipanel(app.Panel);
app.HardwarePanel.Title = 'Hardware';
app.HardwarePanel.Position = [10 560 527 95];
% Create GridLayout11
app.GridLayout11 = uigridlayout(app.HardwarePanel);
app.GridLayout11.ColumnWidth = {'1x', '3x'};
app.GridLayout11.Padding = [5 5 5 5];
% Create Refresh
app.Refresh = uibutton(app.GridLayout11, 'push');
app.Refresh.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);
app.Refresh.Layout.Row = 2;
app.Refresh.Layout.Column = 2;
app.Refresh.Text = 'Refresh';
% Create PortLabel
app.PortLabel = uilabel(app.GridLayout11);
app.PortLabel.HorizontalAlignment = 'right';
app.PortLabel.Layout.Row = 1;
app.PortLabel.Layout.Column = 1;
app.PortLabel.Text = 'Port';
% Create PortList
app.PortList = uidropdown(app.GridLayout11);
app.PortList.Items = {'COM?'};
app.PortList.Editable = 'on';
app.PortList.BackgroundColor = [1 1 1];
app.PortList.Layout.Row = 1;
app.PortList.Layout.Column = 2;
app.PortList.Value = 'COM?';
% Create Panel_2
app.Panel_2 = uipanel(app.Panel);
app.Panel_2.Position = [12 654 525 80];
% Create BCon
app.BCon = uibutton(app.Panel_2, 'push');
app.BCon.ButtonPushedFcn = createCallbackFcn(app, @BConButtonPushed, true);
app.BCon.Position = [44 19 112 23];
app.BCon.Text = 'Connect';
% Create BDiscon
app.BDiscon = uibutton(app.Panel_2, 'push');
app.BDiscon.ButtonPushedFcn = createCallbackFcn(app, @BDisconButtonPushed, true);
app.BDiscon.Position = [227 19 124 23];
app.BDiscon.Text = 'Disconnect';
% Create ConnLamp
app.ConnLamp = uilamp(app.Panel_2);
app.ConnLamp.Position = [418 19 32 32];
app.ConnLamp.Color = [1 0 0];
% Create ConnecttoHardwarefirstLabel
app.ConnecttoHardwarefirstLabel = uilabel(app.Panel_2);
app.ConnecttoHardwarefirstLabel.FontWeight = 'bold';
app.ConnecttoHardwarefirstLabel.FontColor = [1 0 0];
app.ConnecttoHardwarefirstLabel.Position = [5 52 152 22];
app.ConnecttoHardwarefirstLabel.Text = 'Connect to Hardware first';
% Create y_axis_1_menu
app.y_axis_1_menu = uidropdown(app.Panel);
app.y_axis_1_menu.Items = {'Select...', 'channel 1', 'channel 2', 'channel 3', 'channel 4', 'channel 5', 'channel 6', 'channel 7', 'channel 8', 'channel 9'};
app.y_axis_1_menu.Tag = 'y_axis_1_menu';
app.y_axis_1_menu.FontSize = 10.6666666666667;
app.y_axis_1_menu.BackgroundColor = [0.729411764705882 0.831372549019608 0.956862745098039];
app.y_axis_1_menu.Position = [39 507 132 22];
app.y_axis_1_menu.Value = 'Select...';
% Create Panel2
app.Panel2 = uipanel(app.UIFigure);
app.Panel2.Title = 'Panel2';
app.Panel2.Position = [545 1 711 666];
% Create UIAxes
app.UIAxes = uiaxes(app.Panel2);
title(app.UIAxes, 'Oscilloscope')
xlabel(app.UIAxes, 'Time (s)')
ylabel(app.UIAxes, 'Data')
zlabel(app.UIAxes, 'Z')
app.UIAxes.XLim = [0 50];
app.UIAxes.YLim = [-1.5 1.5];
app.UIAxes.XTick = [0 5 10 15 20 25 30 35 40 45 50];
app.UIAxes.XGrid = 'on';
app.UIAxes.YGrid = 'on';
app.UIAxes.Position = [55 10 653 614];
% Create Panel3
app.Panel3 = uipanel(app.UIFigure);
app.Panel3.Title = 'Panel3';
app.Panel3.Position = [547 667 712 99];
% Create StartPlotButton
app.StartPlotButton = uibutton(app.Panel3, 'push');
app.StartPlotButton.ButtonPushedFcn = createCallbackFcn(app, @StartPlotButtonPushed, true);
app.StartPlotButton.BackgroundColor = [0.3294 0.9216 0.3294];
app.StartPlotButton.FontWeight = 'bold';
app.StartPlotButton.FontColor = [0.149 0.149 0.149];
app.StartPlotButton.Position = [70 16 100 47];
app.StartPlotButton.Text = 'Start Plot';
% Create StopButton
app.StopButton = uibutton(app.Panel3, 'push');
app.StopButton.ButtonPushedFcn = createCallbackFcn(app, @StopButtonPushed, true);
app.StopButton.BackgroundColor = [1 0 0];
app.StopButton.FontWeight = 'bold';
app.StopButton.FontColor = [0.149 0.149 0.149];
app.StopButton.Position = [218 18 100 47];
app.StopButton.Text = 'Stop';
% Create SaveDataButton
app.SaveDataButton = uibutton(app.Panel3, 'push');
app.SaveDataButton.ButtonPushedFcn = createCallbackFcn(app, @SaveDataButtonPushed, true);
app.SaveDataButton.BackgroundColor = [0.8 0.8 0.8];
app.SaveDataButton.FontWeight = 'bold';
app.SaveDataButton.FontColor = [0.149 0.149 0.149];
app.SaveDataButton.Position = [516 16 100 47];
app.SaveDataButton.Text = 'Save Data';
% Create ResetButton
app.ResetButton = uibutton(app.Panel3, 'push');
app.ResetButton.ButtonPushedFcn = createCallbackFcn(app, @ResetButtonPushed, true);
app.ResetButton.BackgroundColor = [0 1 1];
app.ResetButton.FontWeight = 'bold';
app.ResetButton.FontColor = [0.149 0.149 0.149];
app.ResetButton.Position = [360 18 100 47];
app.ResetButton.Text = 'Reset';
% 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 = OscilloscopeGUI
% 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

Answers (1)

Pavan Guntha
Pavan Guntha on 28 Jul 2021
Hi Ashleigh,
I understand that the issue is regarding the integration of stop button with the uiaxes. You could look at the attached example app which illustrates the required behaviour.
Hope this helps!

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