Dynamic Display in edit text box

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Brendan Dsouza
Brendan Dsouza 2022-10-17
回答： Satyam 2025-6-6
I am integrating arduino with Matlab, which involves the use of ir sensor(TRCT 500). I am displaying the voltage read of the analog pin for ir sensor. So instead of pressing push button to get the varying outputs, i want it to be automatic. I tried with the timefcn but dont know how to apply it here.
function varargout = ir_sensor1(varargin)
% IR_SENSOR1 MATLAB code for ir_sensor1.fig
% IR_SENSOR1, by itself, creates a new IR_SENSOR1 or raises the existing
% singleton*.
%
% H = IR_SENSOR1 returns the handle to a new IR_SENSOR1 or the handle to
% the existing singleton*.
%
% IR_SENSOR1('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in IR_SENSOR1.M with the given input arguments.
%
% IR_SENSOR1('Property','Value',...) creates a new IR_SENSOR1 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before ir_sensor1_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to ir_sensor1_OpeningFcn via varargin.
%
% *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 ir_sensor1
% Last Modified by GUIDE v2.5 17-Oct-2022 20:59:06
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @ir_sensor1_OpeningFcn, ...
'gui_OutputFcn', @ir_sensor1_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 ir_sensor1 is made visible.
function ir_sensor1_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 command line arguments to ir_sensor1 (see VARARGIN)
% Choose default command line output for ir_sensor1
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes ir_sensor1 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = ir_sensor1_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;
clear all;
global a;
a = arduino('COM5');
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global a;
voltage = 100*readVoltage(a,'A0');
set(handles.valtxt,'String',voltage);
if voltage <= 90
set(handles.racetext,'String','None');
else
set(handles.racetext,'String','No bitches');
end
function valtxt_Callback(hObject, eventdata, handles)
% hObject handle to valtxt (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of valtxt as text
% str2double(get(hObject,'String')) returns contents of valtxt as a double
% --- Executes during object creation, after setting all properties.
function valtxt_CreateFcn(hObject, eventdata, handles)
% hObject handle to valtxt (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function racetext_Callback(hObject, eventdata, handles)
% hObject handle to racetext (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of racetext as text
% str2double(get(hObject,'String')) returns contents of racetext as a double
% --- Executes during object creation, after setting all properties.
function racetext_CreateFcn(hObject, eventdata, handles)
% hObject handle to racetext (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end

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回答（1 个）

Satyam
Satyam 2025-6-6
Hi Brendan,
To automatically and continuously update the IR sensor reading (without pressing the button each time), a ‘timer’ object is better suited than ‘timefcn’ for GUI-based applications in MATLAB. Refer to the documentation of ‘timer’ class to know about related arguments and their syntax. https://www.mathworks.com/help//releases/R2021a/matlab/ref/timer-class.html
Here is a sample code of how we can achieve that:
Modify the ‘ir_sensor1_OpeningFcn’ function to add ‘timer’ object initialization as follows:
function ir_sensor1_OpeningFcn(hObject, eventdata, handles, varargin)
% Choose default command line output for ir_sensor1
handles.output = hObject;
% Initialize Arduino
global a;
a = arduino('COM5'); % Update port if needed
% Set up timer for automatic reading
handles.t = timer('ExecutionMode', 'fixedSpacing', ...
'Period', 1, ...
'TimerFcn', {@updateSensor, hObject});
start(handles.t); % Start timer
% Update handles structure
guidata(hObject, handles);
‘pushbutton1_Callback’ function needs to be replaced by ‘updateSensor’ function. Here is the sample code for the same:
function updateSensor(~, ~, hObject)
handles = guidata(hObject);
global a;
% Read sensor
voltage = 100 * readVoltage(a, 'A0');
% Update GUI text
if isfield(handles, 'valtxt') && ishandle(handles.valtxt)
set(handles.valtxt, 'String', voltage);
end
if isfield(handles, 'racetext') && ishandle(handles.racetext)
if voltage <= 90
%If condition
else
%Else condition
end
end
end

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