Plotting Data Continuously From Arduino Serial

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Noa Reisner-Stehman
编辑： Technical 2023-1-9
I am currently attempting to read in data from an alcohol sensor in Arduino. The code works with a for loop, with the data being stored as a vector.
I would like to plot this data against time, for an infinite amount of time. I have tried using an infinite while loop, but it failed to update the graph each time (no points show up).
The Code looks like this:
arduino= serial('/dev/cu.usbserial-DA01P0H8', 'BaudRate', 9600); fopen(arduino);
pause on;
x = 0; y = 1;
while 1 == 1
alcohol = fscanf(arduino, '%f');
time = x;
plot(x, alcohol);
pause(5);
x = x + 5;
y = y + 1;
end
Any help would be appreciated! Thanks :)

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回答（2 个）

Nick
Nick 2017-4-7
编辑：Nick 2017-4-7
This is an old code I had before Arduino had a support package so I'm getting data from the Arduino a different way but this will plot until you stop it.
%This is a script that will plot Arduino analogRead values in real time
%Modified from http://billwaa.wordpress.com/2013/07/10/matlab-real-time-serial-data-logger/
%The code from that site takes data from Serial
clear
clc
%User Defined Properties
a = arduino('Com13') % define the Arduino Communication port
plotTitle = 'Arduino Data Log'; % plot title
xLabel = 'Elapsed Time (s)'; % x-axis label
yLabel = 'Temperature (C)'; % y-axis label
legend1 = 'Temperature Sensor 1'
legend2 = 'Temperature Sensor 2'
legend3 = 'Temperature Sensor 3'
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
plotGraph = plot(time,data,'-r' ) % every AnalogRead needs to be on its own Plotgraph
hold on %hold on makes sure all of the channels are plotted
plotGraph1 = plot(time,data1,'-b')
plotGraph2 = plot(time, data2,'-g' )
title(plotTitle,'FontSize',15);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
legend(legend1,legend2,legend3)
axis([yMin yMax min max]);
grid(plotGrid);
tic
while ishandle(plotGraph) %Loop when Plot is Active will run until plot is closed
dat = a.analogRead(0)* 0.48875855327; %Data from the arduino
dat1 = a.analogRead(2)* 0.48875855327;
dat2 = a.analogRead(4)* 0.48875855327;
count = count + 1;
time(count) = toc;
data(count) = dat(1);
data1(count) = dat1(1)
data2(count) = dat2(1)
%This is the magic code
%Using plot will slow down the sampling time.. At times to over 20
%seconds per sample!
set(plotGraph,'XData',time,'YData',data);
set(plotGraph1,'XData',time,'YData',data1);
set(plotGraph2,'XData',time,'YData',data2);
axis([0 time(count) min max]);
%Update the graph
pause(delay);
end
delete(a);
disp('Plot Closed and arduino object has been deleted')
Tommy Fu
Tommy Fu 2019-6-10
编辑：Tommy Fu 2019-6-10
Nick's program works. But when run the MATLAB program, it seems MATLAB will write something into the Arduino board to override the Arduino program in the board. I would like to consult that how I can solve this problem. Thank you!
  1 个评论
Akash Kalghatgi
Akash Kalghatgi 2021-2-3
For this, you have to update the following lines
device = serialport("com9", 115200)
data = readline(device) %if your device uses serial print
%OR
data = read(device,1,"double") %if your device uses serial write

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