How to create a countdown timer ?

I want to create a timer with limit of 30s.

My friend have tried to do the coding but the time always exceed 30s.

Can you help us out :))

Answer 1

[Max Heimann]

If you just want a 30 second delay in you code, you can use this:

pause(30)

If you want some form of visible timer you could use something like this:

waittime = 30;
interval = 1;
timepassed = 0;
while timepassed < waittime
    pause(interval)
    timepassed = timepassed + interval;
    disp(['Time passed:' num2str(timepassed)])
end

If this isnt precise for your usecase you could incorporate tic/toc into your code to account for the overhead produced by the console output and calculations. Or you could get the starttime with datetime and then compare to that in every loop cycle.

[MUHAMMAD LUQMAN CHE LAH]

If i want to create a countdown timer like this , can we apply the same coding ?

[Max Heimann]

Its really just a loop that counts up in 1 second intervalls. If you want to change the visual representation you have to replace the "disp" command with an output command of your choosing.

If you dont want the output in the console you could plot the numbers into a figure and then update the data and refresh the figure each loop cycle with the "drawnow" command.

Answer 2

[Image Analyst]

See attached demo. Adapt as needed.