how to draw real time plot in guide matlab

i am taking 3 input sensor values from the arduino. i want to plot these values in 3 different axes created in matlab guide.these plot should be in real time.how can i get the sensor data separetely.i treid to write code for single sensor here is the code

function varargout = vvx(varargin)
% VVX M-file for vvx.fig
%      VVX, by itself, creates a new VVX or raises the existing
%      singleton*.
%
%      H = VVX returns the handle to a new VVX or the handle to
%      the existing singleton*.
%
%      VVX('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in VVX.M with the given input arguments.
%
%      VVX('Property','Value',...) creates a new VVX or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before vvx_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to vvx_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 vvx

% Last Modified by GUIDE v2.5 02-Apr-2015 18:56:28

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @vvx_OpeningFcn, ...
                   'gui_OutputFcn',  @vvx_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 vvx is made visible.
function vvx_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 vvx (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line.
function varargout = vvx_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 start.
function start_Callback(hObject, eventdata, handles)
% hObject    handle to start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

obj = serial('COM17'); %creating the object

set(obj,'BaudRate',9600) %setting baudrate

fopen(obj); %open port

set(obj,'terminator','cr') %providing the terminator
pressure1=0; % a variable for y axis

time1=now; % time is in x axis

while 2>1
    time2=now;

      x=[time1 time2];

     pressure2 = fscanf(obj) ;
     pressure=[pressure1 pressure2];

     if (pressure>200)&(pressure<500) 
      set(handles,'XData','g',[get(handles,'XData') x]);
      set(handles,'YData','g',[get(handles,'YData') a]);
     else if (pressure >300)&(pressure<700)
      set(handles,'XData','o',[get(handles,'XData') x]);
      set(handles,'YData','o',[get(handles,'YData') a])
         else
              set(handles,'XData','r',[get(handles,'XData') x]);
      set(handles,'YData','r',[get(handles,'YData') a])
         end

     end
      set(handles.uitable1, 'data', a2);
      drawnow;

      datetick('x','HH:MM') %change the axis

      pause(0.5);

      pressure1=pressure2;

      time1=time2;
  end

Answer 1

[Geoff Hayes]

raki - rather than using a while loop in your start button callback, consider using a timer to read data from Arduino. See an example at not able to read into MATLAB from serial Arduino using a timer to get an idea of how to do this.

As for your above code not doing what you expect, look closely at what you are trying to set with the new XData and YData

 if (pressure>200)&(pressure<500) 
      set(handles,'XData','g',[get(handles,'XData') x]);
      set(handles,'YData','g',[get(handles,'YData') a]);
 else if (pressure >300)&(pressure<700)
      set(handles,'XData','o',[get(handles,'XData') x]);
      set(handles,'YData','o',[get(handles,'YData') a])
 else
      set(handles,'XData','r',[get(handles,'XData') x]);
      set(handles,'YData','r',[get(handles,'YData') a])
 end
 end

The above code has too many ends (unless you are missing an if in there) so please remove the last one. And look at any of the

 set(handles,...

handles is a structure of handles to the GUI controls (start, uitable1, axes1, axes2, axes3, etc.) and is not a handle to particular graphics object like a plot which is what I think you are intending it to be.

For example, you would need something like

 % create a graphics object for a particular axes
 handles.hPlot1 = plot(handles.axes1, NaN, NaN);
 guidata(hObject, handles);

In the above we have created an "empty" plot on axes1, and then save the graphics handle to the handles structure (using guidata). Note that this code could be written in your GUI's opening function. Now, in the timer callback (or in what you have done above), you would do

 if (pressure>200)&(pressure<500) 
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], ...
                         'MarkerEdgeColor', 'g');
 else if (pressure >300)&(pressure<700)
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], ...
                         'Marker','o');
 else
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], …
                         'MarkerEdgeColor', 'r');
 end

Note that your above code changes the current and all of the past pressure data which may not be desirable.

Note also, that you haven't defined a.

[raki]

sir i modified the program and run it but i get an error

??? Error using ==> set
Invalid parameter/value pair arguments

Error in ==> ssssss>pushbutton1_Callback at 115
             set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> ssssss at 42
    gui_mainfcn(gui_State, varargin{:});

Error in ==>
@(hObject,eventdata)ssssss('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

here is the code

function varargout = ssssss(varargin)
% SSSSSS M-file for ssssss.fig
%      SSSSSS, by itself, creates a new SSSSSS or raises the existing
%      singleton*.
%
%      H = SSSSSS returns the handle to a new SSSSSS or the handle to
%      the existing singleton*.
%
%      SSSSSS('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in SSSSSS.M with the given input arguments.
%
%      SSSSSS('Property','Value',...) creates a new SSSSSS or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before ssssss_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to ssssss_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 ssssss

% Last Modified by GUIDE v2.5 05-Apr-2015 18:09:10

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @ssssss_OpeningFcn, ...
                   'gui_OutputFcn',  @ssssss_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 ssssss is made visible.
function ssssss_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 ssssss (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line.
function varargout = ssssss_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)
% 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)
obj = serial('COM17'); %creating the object

set(obj,'BaudRate',9600) %setting baudrate

fopen(obj); %open port

set(obj,'terminator','cr') %providing the terminator
pressure1=0; % a variable for y axis

time1=now; % time is in x axis
 % create a graphics object for a particular axes
 handles.hPlot1 = plot(handles.axes1, NaN, NaN);
 guidata(hObject, handles);

while 2>1 % infinite loop

      time2=now;

      x=[time1 time2];

     ip_data = fscanf(obj) ;

      pressure2= str2num(ip_data) ; 

      pressure=[pressure1 pressure2];

      line(x,pressure);
            if and(gt(pressure,200),lt(pressure,500))     
        set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
            handles.hPlot1,'YData',[get(handles.hPlot1,'YData') pressure], 'g');
            else if and(gt(pressure ,300),lt(pressure,700))
        set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                 handles.hPlot1,'YData',[get(handles.hPlot1,'YData') pressure], 'o');
                else
               set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
              handles.hPlot1,'YData',[get(handles.hPlot1,'YData') pressure], 'r');

                end
      datetick('x','HH:MM') %change the axis

      pause(0.5);

      pressure1=pressure2;

      time1=time2;
            end 

end

[Geoff Hayes]

I made a copy and paste mistake in the set. I've updated my answer with the correction (there is no need for the second handles.hPlot1).

[raki]

sir now i run the code but for the given condition the color change not obtained in the real time graph

[Geoff Hayes]

Raki - please explain what you mean by the color change not obtained in the real time grpah. Which colour do you see? Which colour are you expecting?

[raki]

the plot obtained is blue in color for all range of the input. i want the color to be changed to green or orange or red depending upon the change in input as mentioned in the code. Can you help me for this?

[Geoff Hayes]

Raki - if you are using the code above, then try replacing the 'MarkerEdgeColor' with just 'Color' to change the colours as

 if (pressure>200)&(pressure<500) 
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], ...
                         'Color', 'g');
 else if (pressure >300)&(pressure<700)
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], ...
                         'Color',[1 0.5 0]);
 else
      set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') x], ...
                         'YData',[get(handles.hPlot1,'YData') a], …
                         'Color', 'r');
 end

Note how [1 0.5 0] is used for orange ('o' corresponds to circles).

[raki]

thank u sir

the code is work fine. sir i want to read both pressure and temperature from arduino to matlab,how to write code for this

[sylvia pan]

Hello sir, I recently use this code to plot real time motion signals,

and i got this

here is the code:

if true
set(handles.hPlot1,'XData',[get(handles.hPlot1,'XData') time_x], ...
                  'YData',[get(handles.hPlot1,'YData') Low_Noise_Accelerometer_X], ...
                  'MarkerEdgeColor', 'm');
end
time_x and Low_Noise_Accelerometer_X are one-dimension arrays.

Could you possibly know why i get this result?

[Geoff Hayes]

I suspect that your time_x data is not ordered correctly or there are duplicate values. Since this array corresponds to time, it should be monotonically increasing. What does it look like? Call

 plot(time_x)

to find out.