Real Time Data Acquisition With Arduino Analog Input

Question

Darryl 2013-7-4

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81147-real-time-data-acquisition-with-arduino-analog-input

编辑： Mehmet Bulun 2017-11-2

I'm in the process of trying to visualise my basic analog light sensor using the plotting function within MatLab.

This is my code so far:

a = arduino('/dev/tty.usbmodem411');
i = 1;
axis = 1;
while (i == 1)
    b = a.analogRead(0);
    axis = axis +1;
    plot(axis, b);
    pause(1);
    drawnow;
end

I figured I'd keep it simple by using a sample rate of 1Hz.

My Y axis is moving up and down dependant on the light sensor value and the x axis is incrementing by 1 every time the loop increments, but I can't actually see the graph actually drawing anything.

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Answer 1

David Sanchez 2013-7-4

0
链接

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https://ww2.mathworks.cn/matlabcentral/answers/81147-real-time-data-acquisition-with-arduino-analog-input#answer_90875

在 MATLAB Online 中打开

Assuming the code on the Arduino side is sending something ( check it out, please ), and that the arduino object points to the right port, try this changes:

a = arduino('/dev/tty.usbmodem411');
i = 1;
axis = 1;
while (i == 1)
    b = a.analogRead(0);
    axis = axis +1;
    plot(axis, b,axis, b,'r*');
    drawnow;
    pause(1);
end

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Darryl 2013-7-4

编辑：Darryl 2013-7-4

Thanks for the reply. Yes 100% its on the correct port and the sensor is working using the values 0 - 1023.

I've just tried your code but all I get is a static red star right in the middle of the graph whilst the x and y axis are moving. Has "hold on" got to be activated?

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Answer 2

Mehmet Bulun 2017-11-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81147-real-time-data-acquisition-with-arduino-analog-input#answer_288989

编辑：Mehmet Bulun 2017-11-2

在 MATLAB Online 中打开

Try below code.

a = arduino('/dev/tty.usbmodem411');
  interval = 1000;
  passo = 1;
  t=1;
  x=0;
  while (t<interval)
      b = a.analogRead(0);
      x=[x,b];
      plot(x);
      axis([,interval,500,500]);%500 and 500 are axis limits
      t=t+passo;
      drawnow;
  end