How to end loop if value does not change for 10 consecutive seconds

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Gianluca Finotti 2018-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/382446-how-to-end-loop-if-value-does-not-change-for-10-consecutive-seconds

评论： Gianluca Finotti 2018-2-20

Hi, I am collecting data from a potentiometer connected to an Arduino. In the script, I tell matlab to keep collecting data for 2 minutes. But I need to tell it that if the user does not move the potentiometer for 10 consecutive seconds, then it should stop the loop and move to the next session (write the data to an excel file). Does anybody have ideas on how to achieve this?

Thank you in advance.

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Answer 1

Madhu Govindarajan 2018-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/382446-how-to-end-loop-if-value-does-not-change-for-10-consecutive-seconds#answer_304973

编辑：Madhu Govindarajan 2018-2-13

在 MATLAB Online 中打开

Here is a potential loop that you can use (with some changes here and there) -

a = arduino;
flag = true;
prevVal = 0;
count = 0;
while flag
    val = readVoltage(a,'your pin number here');
    if abs(val - prevVal) < eps % You can change the eps value to something reasonable based on what you see. 
        count = count + 1;
    else
        count = 0;
    end
    if count == 10
        flag = false;
    end
    prevVal = val;
end