Display Arduino voltage and resistance output on MATLAB GUI

I have developed a MATLAB GUI using Appdesign. This GUI ommuniates with arduino mega. the arduino is a diode and resistor tester. The gui selects either the resistor or diode tester. this also then displays the measured values on a 16x2 lcd. the problem i am facing is displaying these vaules in the GUI in a text box or simply displaying the value.

PLease help. thanks in advance.

[DGM]

Can you programmatically get these values into the workspace already?

If not, you'll have to describe the code that's actually on the MCU and the code that's used for communicating with it.

[trishen beeharie]

Could you please advise how to do it programitically. below is my arduino code then matlab code, basically i want di and R2 values to be displayed on matlab gui.

#include <Wire.h>
#include <hd44780.h>
#include <Wire.h>
#include <hd44780ioClass/hd44780_I2Cexp.h> // i2c expander i/o class header
hd44780_I2Cexp lcd;

int mode = 1;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
}

void loop() {
  if (Serial.available() > 0) // if there is data to read
  {
    //digitalWrite(ledPin2,HIGH);
    float matlabData = Serial.parseFloat(); // read data
    if (matlabData==1)
    {
      mode=1; 
    }
    else if (matlabData==2)
    {
      mode=2;
    }
  }

if(mode==1) 
{
float D=0;
float Di=0;
 D=analogRead(A0);
 Di = D* (5.0/1023.0);
 //if (D>4){lcd.setCursor(0,1);
 //lcd.print("No diode");}
 if(Di>0.08)
 {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Voltage drop");
  lcd.setCursor(0,1);
  lcd.print(Di);
  lcd.print("V");
 delay(200);
 }
}

else if(mode==2)
{
float raw = 0;
float Vin = 5;
float Vout = 0;
float R1 = 977; // value of 1k resistor
float R2 = 0;
float buffer = 0;
lcd.clear();
   raw = analogRead(A1);
   if(raw==0){lcd.setCursor(1, 1);
   lcd.print("      Open      ");}
  if(raw){
    buffer = raw * Vin;
    Vout = (buffer)/1023.0;
    buffer = (Vin/Vout) - 1;
    R2 = R1 * buffer;
     lcd.setCursor(0,0);
  lcd.print("Reisistance");
    lcd.setCursor(3, 1);
    if(R2>999.99){
    lcd.print(R2/977);
    lcd.print(" K Ohm  ");
    }else{
    lcd.setCursor(3, 1);
    lcd.print(R2);
    lcd.print(" Ohm   ");
      }
       delay(200);
  }
}

}

classdef ComponentTesterahbed < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                  matlab.ui.Figure
        StartButton               matlab.ui.control.Button
        ResistanceTextArea        matlab.ui.control.TextArea
        ResistanceTextAreaLabel   matlab.ui.control.Label
        VoltagedropTextArea       matlab.ui.control.TextArea
        VoltagedropTextAreaLabel  matlab.ui.control.Label
        COMPONENTTESTERLabel      matlab.ui.control.Label
        OptionsButtonGroup        matlab.ui.container.ButtonGroup
        ResistorTesterButton      matlab.ui.control.RadioButton
        DiodeTesterButton         matlab.ui.control.RadioButton
    end

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

        % Button pushed function: StartButton
        function StartButtonPushed(app, event)
             mode=0;
            if(app.OptionsButtonGroup.SelectedObject==app.DiodeTesterButton)
                mode="1";
               
                
            elseif(app.OptionsButtonGroup.SelectedObject==app.ResistorTesterButton)
                mode="2";
            end 
            clear ar;
            global ar;
            ar = serial('COM5','BaudRate',9600);
            %Open arduino USB port
            fopen(ar);
            pause(2);

            fprintf(ar,'%s',mode);
           
            pause(2);
            %Close arduino USB port
            fclose(ar);
        end

        % Selection changed function: OptionsButtonGroup
        function OptionsButtonGroupSelectionChanged(app, event)
            selectedButton = app.OptionsButtonGroup.SelectedObject;
            if selectedButton==app.DiodeTesterButton
                app.ResistanceTextArea.Visible='off';
                app.ResistanceTextAreaLabel.Visible='off';
                app.VoltagedropTextArea.Visible='on';
                app.VoltagedropTextAreaLabel.Visible='on';
            elseif selectedButton==app.ResistorTesterButton
                app.VoltagedropTextArea.Visible='off';
                app.VoltagedropTextAreaLabel.Visible='off';
                app.ResistanceTextArea.Visible='on';
                app.ResistanceTextAreaLabel.Visible='on';
            end
        end

        % Callback function
        function VoltagedropTextAreaValueChanged(app, event)
         
        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 = [100 100 326 461];
            app.UIFigure.Name = 'MATLAB App';

            % Create OptionsButtonGroup
            app.OptionsButtonGroup = uibuttongroup(app.UIFigure);
            app.OptionsButtonGroup.SelectionChangedFcn = createCallbackFcn(app, @OptionsButtonGroupSelectionChanged, true);
            app.OptionsButtonGroup.TitlePosition = 'centertop';
            app.OptionsButtonGroup.Title = 'Options';
            app.OptionsButtonGroup.Position = [1 278 325 110];

            % Create DiodeTesterButton
            app.DiodeTesterButton = uiradiobutton(app.OptionsButtonGroup);
            app.DiodeTesterButton.Text = 'Diode Tester';
            app.DiodeTesterButton.Position = [11 64 89 22];
            app.DiodeTesterButton.Value = true;

            % Create ResistorTesterButton
            app.ResistorTesterButton = uiradiobutton(app.OptionsButtonGroup);
            app.ResistorTesterButton.Text = 'Resistor Tester';
            app.ResistorTesterButton.Position = [11 43 102 22];

            % Create COMPONENTTESTERLabel
            app.COMPONENTTESTERLabel = uilabel(app.UIFigure);
            app.COMPONENTTESTERLabel.HorizontalAlignment = 'center';
            app.COMPONENTTESTERLabel.FontSize = 20;
            app.COMPONENTTESTERLabel.FontWeight = 'bold';
            app.COMPONENTTESTERLabel.Position = [6 416 316 24];
            app.COMPONENTTESTERLabel.Text = 'COMPONENT TESTER';

            % Create VoltagedropTextAreaLabel
            app.VoltagedropTextAreaLabel = uilabel(app.UIFigure);
            app.VoltagedropTextAreaLabel.HorizontalAlignment = 'right';
            app.VoltagedropTextAreaLabel.Position = [123 204 73 22];
            app.VoltagedropTextAreaLabel.Text = 'Voltage drop';

            % Create VoltagedropTextArea
            app.VoltagedropTextArea = uitextarea(app.UIFigure);
            app.VoltagedropTextArea.Position = [84 128 150 60];

            % Create ResistanceTextAreaLabel
            app.ResistanceTextAreaLabel = uilabel(app.UIFigure);
            app.ResistanceTextAreaLabel.HorizontalAlignment = 'right';
            app.ResistanceTextAreaLabel.Visible = 'off';
            app.ResistanceTextAreaLabel.Position = [130 204 65 22];
            app.ResistanceTextAreaLabel.Text = 'Resistance';

            % Create ResistanceTextArea
            app.ResistanceTextArea = uitextarea(app.UIFigure);
            app.ResistanceTextArea.HorizontalAlignment = 'center';
            app.ResistanceTextArea.Visible = 'off';
            app.ResistanceTextArea.Position = [85 128 154 60];

            % Create StartButton
            app.StartButton = uibutton(app.UIFigure, 'push');
            app.StartButton.ButtonPushedFcn = createCallbackFcn(app, @StartButtonPushed, true);
            app.StartButton.Position = [125 254 100 22];
            app.StartButton.Text = 'Start';

            % 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 = ComponentTesterahbed

            % Create UIFigure and components
            createComponents(app)

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

            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

Answer 1

[Sivani Pentapati]

Hi trishen,

Based on my understanding, you want to display the measured values from arduino board in a GUI made with App Designer. Firstly you can receive the measured values in the form of serial data from the device using Arduino Hardware Simulink Model. Secondly you can execute this model at the backend to fetch the values and update them accordingly in the App Designer. Please refer to this link of how to interact with Simulink Models from App Designer.