Blink LED at specify time with Matlab - Arduino

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melisa samad
melisa samad on 1 Feb 2018
Commented: ishani uthpala on 10 Mar 2021
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
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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