How to live plot multple sine waves from Arduino to MATLAB

Question

Ashleigh Reid 2021-6-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/857675-how-to-live-plot-multple-sine-waves-from-arduino-to-matlab

Hi,

I'm trying to plot multiple sine waves plots from an Arduino Mega to Matlab. I've managed to live plot one sine wave curve already from arduino to matlab. However, I'm a bit unsure on how to do muiltple, I think I'll need an array of some sort to store the data but needing some guidance.

MATLAB code:

delete(instrfindall);
clc;
 
serialPort = 'COM4';            
plotTitle = 'Sine Wave';  
xLabel = 'Time (s)';            
yLabel = 'Data';                
plotGrid = 'on';                
min = -1.5;                     
max = 1.5;                                   
delay = .01;                   
 
%Define Function Variables
time = 0;
data = 0;
count = 0;
 
%Set up Plot
plotGraph = plot(time,data,'-r');
             
title(plotTitle,'FontSize',18);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
axis([0 10 min max]);
grid(plotGrid);
 
%Open Serial COM Port
s= serial(serialPort);
disp('Close Plot to clear data');
fopen(s);
% start stopwatch timer
tic 
 
%Loop when Plot is Active
while time <=50
    
    %Read Data from Serial as Float
    dat = fscanf(s,'%f'); 
  
    if(~isempty(dat) && isfloat(dat)) %Make sure Data Type is Correct        
        count = count + 1;    
        time(count) = toc;    %stop the stopwatch and extract time
        data(count) = dat(1); %Extract 1st Data Element        
        set(plotGraph,'XData',time,'YData',data);
        axis([0 time(count) min max]);
        drawnow;
    end
         
        %Allow MATLAB to Update Plot
        pause(delay);
    
end
 
%Close Serial COM Port and Delete useless Variables
fclose(s);
clear count dat delay max min plotGraph plotGrid plotTitle s ...
        scrollWidth serialPort xLabel yLabel;