I need help to solve this problem, I don't understand why it's not working

function varargout = Classroom_security(varargin)
%CLASSROOM_SECURITY MATLAB code file for Classroom_security.fig
%      CLASSROOM_SECURITY, by itself, creates a new CLASSROOM_SECURITY or raises the existing
%      singleton*.
%
%      H = CLASSROOM_SECURITY returns the handle to a new CLASSROOM_SECURITY or the handle to
%      the existing singleton*.
%
%      CLASSROOM_SECURITY('Property','Value',...) creates a new CLASSROOM_SECURITY using the
%      given property value pairs. Unrecognized properties are passed via
%      varargin to Classroom_security_OpeningFcn.  This calling syntax produces a
%      warning when there is an existing singleton*.
%
%      CLASSROOM_SECURITY('CALLBACK') and CLASSROOM_SECURITY('CALLBACK',hObject,...) call the
%      local function named CALLBACK in CLASSROOM_SECURITY.M with the given input
%      arguments.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Classroom_security

% Last Modified by GUIDE v2.5 04-Feb-2023 10:12:32

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
    'gui_Singleton',  gui_Singleton, ...
    'gui_OpeningFcn', @Classroom_security_OpeningFcn, ...
    'gui_OutputFcn',  @Classroom_security_OutputFcn, ...
    'gui_LayoutFcn',  [], ...
    'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before Classroom_security is made visible.
function Classroom_security_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   unrecognized PropertyName/PropertyValue pairs from the
%            command line (see VARARGIN)

% Choose default command line output for Classroom_security
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes Classroom_security wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = Classroom_security_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in Classroom.
function Classroom_Callback(hObject, eventdata, handles)
% hObject    handle to Classroom (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Fenetre (Infraction)
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a
a = arduino('COM8', 'UNO','Libraries',{'Ultrasonic','Servo'}) 
configurePin(a,'D11','Tone')
while 1==1
    mouv=readDigitalPin(a,'D10')
    if mouv==1
        playTone(a,'D11',1200,1);
    else
        playTone(a,'D11',1200,0)
    end
end
% Porte de la classe
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a
a = arduino('COM8', 'UNO','Libraries',{'Ultrasonic','Servo'})
servo1=servo(a,'D10')

sensor= ultrasonic(a,'D12','D13');
while 1==1
    x=(readDistance(sensor))*100
    if x<10
        writePosition(servo1, 1)
        pause(5)
    else
        writePosition(servo1, 0)
    end
    
end

% Capteur de gaz
% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a
a=arduino('COM6','UNO','Libraries',{'servo'})
servo1=servo(a,'D8')
while 1==1
    gaz=readDigitalPin(a,'A0')
    if gaz==1
        writePosition(servo1, .7)
    else
        writePosition(servo1, 0)
        
    end
end
% Capteur de flamme
% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a
a = arduino('COM8', 'UNO','Libraries',{'Ultrasonic','Servo'}) 
capteurflamme=readDigitalPin(a,'D8')
configurePin(a,'D11','Tone')
servo1=servo(a,'D4')
servo2=servo(a,'D5')
while 1==1
    capteurflamme=readDigitalPin(a,'D8')
    if capteurflamme==1
        writePosition(servo1, 1)
        writePosition(servo2, 1) % fenetre ouverte
        
        playTone(a,'D11',1200,1)% siréne allumée
        writeDigitalPin(a,'D7',1);
        pause(5)
        
    else
        writePosition(servo1, 0)% fenetre fermée
        writePosition(servo2, 0)
        playTone(a,'D11',1200,0)% siréne éteinte
        writeDigitalPin(a,'D7',0);
    end
end

[Birane Abdoulaye Ba]

Voici ce que ca me montre dans la commande window

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in Classroom_security (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Classroom_security('pushbutton3_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

Answer 1

[Walter Roberson]

configure the arduino and servos once in Classroom_security_OpeningFcn

not in every callback.

Also use try/catch in case the arduino cannot be reached (perhaps because a connection is still hanging around from last time you ran, as you do not remove the connection after you are done with it)