MATLAB: Plotting live data from a sensor

dataplottingsignal

Hello,
I'm trying to plot a line graph of the live data from my sensor. However, when I run my code is does not display the line.
Thanks in advance
code:
clear all;
S = serialport('COM5',115200);
temp =[];
accx=[];
accy=[];
accz=[];
i = 0;
while true
    if S.NumBytesAvailable > 0
        data = readline(S); 
        temp = [str2double(split(data,','))]; 
        accx = [accx;temp(1)];
        accy = [accy;temp(2)];
        accz = [accz;temp(3)];
        plot(i,temp(1))
        i=i+1;
    end
end

Best Answer

You are plotting only one point at a time and without having executed a hold on instruction, each call to plot creates a new line object, deleting the previous. So, at most you would have a dot moving across the axis if the marker size were large enough to see it. To observe this, change your present plot() call to
plot(i,temp(1),'markersize',10)
To do this kind of thing you need to use hold on and update the XData,YData arrays instead, or use the new AnimatedLine feature. See
https://www.mathworks.com/help/matlab/creating_plots/animation-techniques-1.html
https://www.mathworks.com/help/matlab/creating_plots/line-animation-of-streaming-data.html
for details and examples.
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