Blink LED at specify time with Matlab - Arduino

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Hi, I want to turn on LED for a given time such as 2 minutes and then it will turn off by using Matlab with Arduino hardware. I already search how to code it but I have no idea how to do it. The code below is my trial.
time = str2num(get(handles.edit3,'String'));
S = seconds(time);
if S > 0
writeDigitalPin(a, 'D13',1);
else
writeDigitalPin(a, 'D13', 0);
end
  2 Comments
Jan
Jan on 1 Feb 2018
@melisa: Please mention, how this question is related to Matlab. How is the LED connected to Matlab? Without knowing this detail, an answer would required to guess.
melisa samad
melisa samad on 1 Feb 2018
hi, thank you for replying and sorry for my mistake. I already edit my question.

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Accepted Answer

Jan
Jan on 4 Feb 2018
Edited: Jan on 4 Feb 2018
time = str2num(get(handles.edit3,'String'));
% S = seconds(time); % [EDITED] Not needed
writeDigitalPin(a, 'D13', 1);
pause(time); % [EDITED] assumed, that edit3 contains the seconds
writeDigitalPin(a, 'D13', 0);
Or with a timer, which does not block Matlab:
TimerH = timer('TimerFcn', {TimerCB, 'off', a}, ...
'StartDelay', time, ... % [EDITED] S -> time
'ExecutionMode', 'SingleShot', ...
'StartFcn', {TimerCB, 'on', a});
start(TimerH);
which calls the Timer callback function at starting and stopping:
function TimerCB(TimerH, EventData, Cmd, a)
switch Cmd
case 'on'
writeDigitalPin(a, 'D13', 1);
case 'off'
writeDigitalPin(a, 'D13', 0);
end
end
  7 Comments

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More Answers (1)

Madhu Govindarajan
Madhu Govindarajan on 2 Feb 2018
You can use tic and toc for this. When you run tic it starts a stopwatch style timer, you can then use toc to know the elapsed time and use a while loop to check if it is still less than your desired elapsed time.
  2 Comments
Walter Roberson
Walter Roberson on 4 Feb 2018
timelimit = 2*60;
writeDigitalPin(a, 'D13',1);
start = tic;
while toc(start) < timelimit
pause(0.01); %do _something_, even if just a useless computation
end
writeDigitalPin(a, 'D13', 0);

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