How do i make MATLAB remember moments in the code?

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Daniel
Daniel 2014-7-20
编辑： Image Analyst 2014-7-21
Hi!
This is my GUI code:
The problem i got is when im press pushbutton1_Callback the function is running this:
a=arduino('COM4');
a.pinMode(9, 'OUTPUT');
a.digitalWrite(9, 1);
msgbox('ON');
a=arduini('COM4') means that the program connecting to the Arduino UNO card. a.pinMode(9, 'OUTPUT') means that the program declare that pin 9 is an output for current. a.digitalWrite(9, 1) means that the LED lamp is ON. msgbox('ON') means that after the program has turn on the LED lamp, a message bos will show up.
My problem is when the message box shows up, the LED lamp turn OFF. My program cannot remember the moments it has read.
If i place this code
a=arduino('COM4');
a.pinMode(9, 'OUTPUT');
in the first function above of the code below and remove the same code in the push button functions
function pushbutton2_Callback(hObject, eventdata, handles)
a.digitalWrite(9, 0);
msgbox('OFF');
i got error if a press any function push button. The error is "I don't know what a or a.digitalWrite are??". Just because the program don't remember that it has run this code before
a=arduino('COM4');
a.pinMode(9, 'OUTPUT');
This is my whole code:
function varargout = First(varargin)
% FIRST MATLAB code for First.fig
% FIRST, by itself, creates a new FIRST or raises the existing
% singleton*.
%
% H = FIRST returns the handle to a new FIRST or the handle to
% the existing singleton*.
%
% FIRST('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in FIRST.M with the given input arguments.
%
% FIRST('Property','Value',...) creates a new FIRST or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before First_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to First_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 First
% Last Modified by GUIDE v2.5 19-Jul-2014 22:43:46
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @First_OpeningFcn, ...
'gui_OutputFcn', @First_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 First is made visible.
function First_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 First (see VARARGIN)
% Choose default command line output for First
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes First wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = First_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 pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
a=arduino('COM4');
a.pinMode(9, 'OUTPUT');
a.digitalWrite(9, 1);
msgbox('ON');
% 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)
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
a=arduino('COM4');
a.pinMode(9, 'OUTPUT');
a.digitalWrite(9, 0);
msgbox('OFF');
% 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)

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回答（1 个）

Image Analyst
Image Analyst 2014-7-20
You probably have the LED reversed. Try turning it around. Have the + side go into pin 9, the - side go into the breadboard and a resistor going from the breadboard to ground.

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