how to detect a keyboard key in a while loop using a figure

Question

Ahsan Ayyaz 2020-7-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/561245-how-to-detect-a-keyboard-key-in-a-while-loop-using-a-figure

评论： Matt 2023-10-27

I am using arduino nano and checking push buttons in a while loop. I want to detect a keyboard key, say 'spacebar' and simulate a push button. A figure with a push button is the desired output. Everytime the figure is in focus and the 'spacebar' is pressed on the keyboard, it should turn on and off a digital output of arduino board.

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Answer 1

Tommy 2020-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/561245-how-to-detect-a-keyboard-key-in-a-while-loop-using-a-figure#answer_462539

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You could use the figure's KeyPressFcn, possibly combined with some of the ideas below:

myFig = figure('KeyPressFcn', @myKeyPressFcn,...
    'UserData', false);
a = 0;
while true
    a = a + rand;
    if myFig.UserData
        close(myFig)
        break
    end
    drawnow % <- important so that myKeyPressFcn() gets called when a key is pressed
end
disp(a)
function myKeyPressFcn(src, evt)
    if strcmp(evt.Key, 'space')
        src.UserData = true;
    end
end

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Tommy 2020-7-10

Glad to hear you got it working!

Matt 2023-10-27

I am trying to implement something similar for a spacebar clicker replica. I want to add a time interval to your code so that spacebar press is emulated after a set interval. can you please help me out here? thanks in advance.

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