plotting few values continuously in real time

i have data coming from the gps and i want to plot it for every one second. like a ecg graph. the values are like 560,940,780. please help

Answer 1

[ag]

Hi @Mamudi,

To plot GPS data in real-time, similar to an ECG graph, you can utilize MATLAB's animatedline function within a loop that updates the plot every second. Below is a structured approach to achieve this:

% Initialize the figure and animated line
figure;
h = animatedline('LineWidth', 2);  % Bold line for clear visibility
ax = gca;                          % Get current axes
ax.YGrid = 'on';                   % Add grid for better visualization
xlabel('Time (s)');
ylabel('GPS Value');
title('Real-Time GPS Data Plot');
% Simulate incoming GPS data (replace this with your actual data)
gps_data = [560, 940, 780, 600, 880, 720, 650, 900, 780]; % Example data
time_interval = 1;  % 1-second interval
t = 0;              % Initialize time counter
% Example for reading from a serial port (adjust COM port and settings)
s = serialport('COM3', 9600);  % Replace 'COM3' and baud rate as needed
while true % modify the breaking condition accordingly
   data = readline(s);        % Read GPS data from the device
   gps_value = str2double(data);  % Convert string to numeric
   t = t + 1;                
   addpoints(h, t, gps_value);
   drawnow;
   pause(1);
end

For more details, please refer to the following MathWorks documentations:

• animatedline - https://www.mathworks.com/help/matlab/ref/animatedline.html
• serialport - https://www.mathworks.com/help/matlab/ref/serialport.html
• readline - https://www.mathworks.com/help/instrument/serialport.readline.html
• addpoints - https://www.mathworks.com/help/matlab/ref/addpoints.html
• drawnow - https://www.mathworks.com/help/matlab/ref/drawnow.html

Hope this helps!

[Walter Roberson]

Note:

animatedline() and addpoints() were not available at the time this question was originally asked.

serialport() and readline() were not available at the time this question was originally asked.