Anyone can help me to understand this code?

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WAN NOR NAZIRA MUSTAPA KAMAL 2021-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/731043-anyone-can-help-me-to-understand-this-code

评论： Walter Roberson 2021-1-30

a = arduino();
imu = mpu6050(a,'SampleRate',50,'SamplesPerRead',10,'ReadMode','Latest');
    figure;
    xlabel('Time (s)');
    ylabel('Acceleration (m/s^2)');
    title('Acceleration values from mpu6050');
    x_val = animatedline('Color','r');
    y_val = animatedline('Color','g');
    z_val = animatedline('Color','b');
    stop_time = 10; %  time in seconds
    count = 1;
    tic;
    while(toc < stop_time)
    data = read(imu);
    addpoints(x_val,count:(count+imu.SamplesPerRead-1),data.Acceleration(:,1));
    addpoints(y_val,count:(count+imu.SamplesPerRead-1),data.Acceleration(:,2));
    addpoints(z_val,count:(count+imu.SamplesPerRead-1),data.Acceleration(:,3));
       count = count + imu.SamplesPerRead;
       pause(0.001);
    end
    release(imu);

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Answer 1

Walter Roberson 2021-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/731043-anyone-can-help-me-to-understand-this-code#answer_610073

It configures an arduino. It configures an accelerometer attached to the arduino. It initializes some variables.

Then it loops for a set amount of clock time, reading 10 accelerometer samples at a time, each with 3 channels, X Y Z. It adds the received data to the corresponding graphics line. It pauses for one millisecond. In this context, really the pause is there to tell the graphics system it is okay to update the display.

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WAN NOR NAZIRA MUSTAPA KAMAL 2021-1-30

"Then it loops for a set amount of clock time", what do you meant by that? And actually I am confused where I tried to run the code, the stop time is 10 second, but why the graph is stop at 500 second? Do you know?

Walter Roberson 2021-1-30

在 MATLAB Online 中打开

Each time the statement

while(toc < stop_time)

is executed, it figures out the elapsed clock time since the tic statement; the value is measured in seconds. When the configures stop_time is reached (so 10 clock seconds have passed since the tic) then the loop exits.

The x axis of the plots are not seconds: they are sample numbers. You configured 50 samples per second, and 50 samples/s * 10 seconds = 500 samples.

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