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

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Ahsan Ayyaz
Ahsan Ayyaz 2020-7-7
评论： Paul 2025-12-1，6:51
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.
  1 个评论
Paul
Paul 2025-12-1，6:51
That’s an interesting setup, especially for anyone trying to build small reaction-based projects. I’ve been experimenting with space-press mechanics myself while messing around with a simple browser game at https://space-bar-clicker.github.io/, and timing intervals really make a difference. Adding a delay to emulate spacebar presses should work well if you trigger it with a timer inside the callback.

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回答（1 个）

Tommy
Tommy 2020-7-8
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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