App Designer and Arduino

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Allison McCrady
Allison McCrady on 20 Feb 2019
Answered: Kihak Lee on 28 Dec 2019
Hi,
I am designing an interface in the App Designer. I have an Arduino board connected to some sensors. I would like to be able to run the interface multiple times, but right now I run it once perfectly and when I click run again it tells me I have an existing connection at my COM port and I need to clear it. I am unsure how to do this as I am very new to app designer! Any help would be greatly appreciated!
Thanks!
  2 Comments
Allison McCrady
Allison McCrady on 20 Feb 2019
classdef app2 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
RUNButton matlab.ui.control.Button
STOPButton matlab.ui.control.Button
UIAxes matlab.ui.control.UIAxes
COMPortEditFieldLabel matlab.ui.control.Label
COMPortEditField matlab.ui.control.EditField
SaveAsEditFieldLabel matlab.ui.control.Label
SaveAsEditField matlab.ui.control.EditField
end
properties (Access = private)
stop;
port;
done=0;
timeLogs;
forceLogs;
timeSecs;
filename;
T;
h;
a;
end
methods (Access = private)
% Code that executes after component creation
function startupFcn(app, a)
app.a=app.a;
end
% Value changed function: COMPortEditField
function COMPortEditFieldValueChanged(app, event)
value = app.COMPortEditField.Value;
app.port=value;
end
% Button pushed function: RUNButton
function RUNButtonPushed(app, event)
app.a=arduino(app.port,'uno');
figure
app.h=animatedline;
ax=gca;
ax.YGrid='on';
ax.YLim=[0 100];
app.stop=false;
starttime=datetime('now');
while ~app.stop
% Read current voltage value
voltage1 = readVoltage(app.a,'A0');
voltage2 = readVoltage(app.a,'A1');
% Calculate force from voltage (based on data sheet)
% Flipped for ease of use
force1=-(13.499*voltage1)+68.534; %from calibration with standard weights
force2=-(9.9586*voltage2)+49.882; %from calibration with standard weights
force=force1+force2;
% Get current time
t = datetime('now') - starttime;
% Add points to animation
addpoints(app.h,datenum(t),force)
% Update axes
ax.XLim = datenum([t-seconds(15) t]);
datetick('x','keeplimits')
drawnow
% Check stop condition
app.stop = app.done;
end
end
% Button pushed function: STOPButton
function STOPButtonPushed(app, event)
app.done=1;
[app.timeLogs,app.forceLogs] = getpoints(app.h);
app.timeSecs = (app.timeLogs-app.timeLogs(1))*24*3600;
app.T = table(app.timeSecs',app.forceLogs','VariableNames',{'Time_sec','Force_N'});
% Write table to file
writetable(app.T,app.filename)
[app.timeLogs,app.forceLogs] = getpoints(app.h);
app.timeSecs = (app.timeLogs-app.timeLogs(1))*24*3600;
plot(app.UIAxes,app.timeSecs,app.forceLogs)
end
% Value changed function: SaveAsEditField
function SaveAsEditFieldValueChanged(app, event)
value = app.SaveAsEditField.Value;
app.filename=value;
end
end
% App initialization and construction
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure
app.UIFigure = uifigure;
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'UI Figure';
% Create RUNButton
app.RUNButton = uibutton(app.UIFigure, 'push');
app.RUNButton.ButtonPushedFcn = createCallbackFcn(app, @RUNButtonPushed, true);
app.RUNButton.BackgroundColor = [0 1 0];
app.RUNButton.Position = [388 22 100 31];
app.RUNButton.Text = 'RUN';
% Create STOPButton
app.STOPButton = uibutton(app.UIFigure, 'push');
app.STOPButton.ButtonPushedFcn = createCallbackFcn(app, @STOPButtonPushed, true);
app.STOPButton.BackgroundColor = [1 0 0];
app.STOPButton.Position = [509 22 100 31];
app.STOPButton.Text = 'STOP';
% Create UIAxes
app.UIAxes = uiaxes(app.UIFigure);
title(app.UIAxes, 'Force vs. Time')
xlabel(app.UIAxes, 'Time')
ylabel(app.UIAxes, 'Force')
app.UIAxes.YGrid = 'on';
app.UIAxes.Position = [11 72 619 398];
% Create COMPortEditFieldLabel
app.COMPortEditFieldLabel = uilabel(app.UIFigure);
app.COMPortEditFieldLabel.HorizontalAlignment = 'right';
app.COMPortEditFieldLabel.Position = [44 52 59 22];
app.COMPortEditFieldLabel.Text = 'COM Port';
% Create COMPortEditField
app.COMPortEditField = uieditfield(app.UIFigure, 'text');
app.COMPortEditField.ValueChangedFcn = createCallbackFcn(app, @COMPortEditFieldValueChanged, true);
app.COMPortEditField.Position = [118 52 100 22];
app.COMPortEditField.Value = 'Com';
% Create SaveAsEditFieldLabel
app.SaveAsEditFieldLabel = uilabel(app.UIFigure);
app.SaveAsEditFieldLabel.HorizontalAlignment = 'right';
app.SaveAsEditFieldLabel.Position = [45 12 54 22];
app.SaveAsEditFieldLabel.Text = 'Save As:';
% Create SaveAsEditField
app.SaveAsEditField = uieditfield(app.UIFigure, 'text');
app.SaveAsEditField.ValueChangedFcn = createCallbackFcn(app, @SaveAsEditFieldValueChanged, true);
app.SaveAsEditField.Position = [114 12 214 22];
end
end
methods (Access = public)
% Construct app
function app = app2(varargin)
% Create and configure components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
% Execute the startup function
runStartupFcn(app, @(app)startupFcn(app, varargin{:}))
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
This is the entire code for the app designer. I think the arduino connection is in the Run button function. I attached a photo of the interface as well for reference! Thank you!

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Accepted Answer

Asad Mirza
Asad Mirza on 22 Feb 2019
You could try changing your startup to just this instead.
function startupFcn(app, a)
app.a=arduino(app.port,'uno');
end
Now remove the arduino(app.port,'uno'); line from your RUNButtonPushed(app, event) function.
This way you only create the arduino object once when you startup the app and then after that all you do is send signals with the button. I do not have an arduino nearby to test this on unfortunately.
  3 Comments
Santiago Restrepo Estrada
Santiago Restrepo Estrada on 28 Jun 2019
Hello,
I was wondering how could I integrate this into an existing app.
thank you

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More Answers (1)

Kihak Lee
Kihak Lee on 28 Dec 2019
Dear Asad Mirza
I tested your attached files(Arduino_Ex.mlapp) several times. There is a problem in disconnect button.
When push disconnect button, error is happend. I can not fix it.
Plese check your code!
thanks

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