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 个评论
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.
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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
2018-2-2
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
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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