Real time plotting of data from csv file

Hello everyone,

I am stuck in one small problem. I am reading data from some sensor and capturing into csv file using terminal. How can I plot that data in real time by continuously reading file. Any lead will be helpful.

Thanks!

Answer 1

[Deepak]

Hi Kishor,

From my understanding, you are reading the data from a sensor and capturing it into a CSV file. You want to plot the data continuously from the CSV file in real time.

To achieve this, we can first set up the MATLAB environment by defining the CSV file path and figure. Now, we can iterate over a loop to continuously read the data from the CSV file using “readmatrix” function and plot it using the “plot” function in MATLAB. As the size of CSV file continues to increase over time, updated plots will get generated in real time.

Here is the MATLAB code to accomplish this task:

% Define the file path 
filePath = 'your_sensor_data.csv'; 

figure; 

while true 
    % Read the CSV file 
    data = readmatrix(filePath); 
    
    % Assuming the data has two columns, time and sensor value 
    time = data(:, 1); 
    sensorValue = data(:, 2); 
    
    plot(time, sensorValue); 
    xlabel('Time'); 
    ylabel('Sensor Value'); 
    title('Real-Time Sensor Data'); 
    grid on; 
    
    % Pause for a short time to allow the plot to update 
    pause(1); 
    
    % Clear the plot for the next update 
    clf; 
end 

Please find attached the documentation of functions used for reference:

readmatrix: www.mathworks.com/help/matlab/ref/readmatrix.html

plot: www.mathworks.com/help/matlab/ref/plot.html

clf: www.mathworks.com/help/matlab/ref/clf.html

I hope you found the information insightful.