Blink LED at specify time with Matlab - Arduino

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melisa samad
melisa samad 2018-2-1
评论： ishani uthpala 2021-3-10
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 个评论
Jan
Jan 2018-2-1
@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 2018-2-1
hi, thank you for replying and sorry for my mistake. I already edit my question.

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采纳的回答

Jan
Jan 2018-2-4
编辑：Jan 2018-2-4
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
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更多回答（1 个）

Madhu Govindarajan
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 个评论
Walter Roberson
Walter Roberson 2018-2-4
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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