How to fix the range of x axis while plotting live signals from Arduino to Matlab

Question

LuYao Guo 2021-2-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/755594-how-to-fix-the-range-of-x-axis-while-plotting-live-signals-from-arduino-to-matlab

回答： Priyank Pandey 2022-12-20

Hi Everyone, I have a question about live plotting from Arduino to Matlab. In the code I attach here, I try to continuously plot the two channels from Arduino to Matlab, but I find that in the plot, the x axis keep increasing thus leads to the compression of plots. Can you please help me to fix the number of x axis so that the x axis is scrolling? Thank you!

clear all
clc
%User Defined Properties 
a = arduino('COM5','ProMini328_5v');           % define the Arduino Communication port
plotTitle = 'Arduino Data Log';  % plot title
xLabel = 'Elapsed Time (s)';     % x-axis label
yLabel = 'Voltage';      % y-axis label
legend1 = 'Optical Channel 1';
legend2 = 'Optical Channel 2';
yMax  = 40                           %y Maximum Value
yMin  = 0                       %y minimum Value
plotGrid = 'on';                 % 'off' to turn off grid
min = 0;                         % set y-min
max = 40;                        % set y-max
delay = .01;                     % make sure sample faster than resolution 
%Define Function Variables
time = 0;
data = 0;
data1 = 0;
data2 = 0;
count = 0;
%Set up Plot
plotGraph1 = plot(time,data1,'-b')
hold on                            %hold on makes sure all of the channels are plotted
plotGraph2 = plot(time, data2,'-g' )
title(plotTitle,'FontSize',15);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
legend(legend1,legend2);
axis([yMin yMax min max]);
grid(plotGrid);
tic
while ishandle(plotGraph1) %Loop when Plot is Active will run until plot is closed
         dat1 = readVoltage(a,'A2'); 
         dat2 = readVoltage(a,'A3'); 
         count = count + 1;    
         time(count) = toc;    
                 
         data1(count) = dat1(1)
         data2(count) = dat2(1)
         
         set(plotGraph1,'XData',time,'YData',data1);
         set(plotGraph2,'XData',time,'YData',data2);
          axis([0 time(count)+10 min max]);
          %xlim([max(0,time(count)-0.1) max(10,time(count)-0.1)]);
          %ylim(min,max);
   
          %Update the graph
          pause(delay);
  end
delete(a);