i am try to get the 4 sensors data from a serial port and my data lies in 13,15,17,19 bytes of a packet .I want to plot the data of each sensor in real time but i am facing problem even though one sensor is giving maximum output i couldnt see it i

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avinash pabbireddy 2014-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/120639-i-am-try-to-get-the-4-sensors-data-from-a-serial-port-and-my-data-lies-in-13-15-17-19-bytes-of-a-pac

评论： avinash pabbireddy 2014-3-13

%run('clean');
clear all;
close all;
delete(instrfindall);
s = serial('COM5'); %assigns the object s to serial port
set(s, 'InputBufferSize', 512); %number of bytes in inout buffer
set(s, 'BaudRate', 115200);
%set(s, 'Timeout',10);
%clc;
fopen(s);           %opens the serial port
t=1;
disp('Running');
x=0;
y=0;
z=0;
w=0;
while(true)  
   a1 =fread(s); %reads the data from the serial port and stores it to the matrix a
     s1=a1(13);
     a=(s1-175)/80;
     x =[x a];% Merging the value to an array, this is not very computationaly effective, as the array size is dynamic.
     plot(x,'Color','g');
     axis auto;
     grid on;
     hold on;
     drawnow;
     s2=a1(15);
     b=(s2-166)/89;
     y =[y b];
      plot(y,'Color','y');
     axis auto;
     grid on;
      hold on;
      drawnow;
     s3=a1(17);
     c=(s3-168)/87;
     z =[z c];
     plot(z,'Color','r');
     axis auto;
     grid on;
      hold on;
      drawnow;
     s4=a1(19);
     d=(s4-166)/89;
     w =[w d];
      plot(w,'Color','b');
     axis auto;
     grid on;
     t=t+1;
     drawnow;
     %a1=0;  %Clear the buffer
end
fclose(s); %close the serial port