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timer with varying periods

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Mihai
Mihai on 18 Dec 2012
Answered: Martin Grden on 7 Oct 2020
Hi all!
I am running a test setup where I need to take measurements at varying intervals that are between the values of 47 < T < 53 seconds.
By this I mean, the period between executions of TimerFcn is not a constant value, rather a random value between 47 and 53.
Do you guys know if this is possible with the timer function?
I checked the 'Period' property of Timer(), and it takes a double value, not a function.
This is how I have my code set up right now.
getMeasurementsTimer = timer();
set(getMeasurementsTimer, 'executionmode', 'fixedRate', 'period', data);
set(getMeasurementsTimer, 'StartFcn', {'startTest', hObject});
set(getMeasurementsTimer, 'TimerFcn', {'getTemp', hObject});

  3 Comments

Jan
Jan on 19 Dec 2012
What are "varying intervals"? Do you want to start the timer at time=47 sec and stop it 6 seconds later?
Daniel Shub
Daniel Shub on 19 Dec 2012
There currently is not enough information to answer this question. Please edit the question and reopen.
Mihai
Mihai on 19 Dec 2012
By varying interval i mean a dynamic value for the "period" property. So between execution one and two it could be 49.555 seconds, and the next time the function is executed is 52.111 seconds later.
One of the requirements is that the difference between the max Tr (period between measurements)and min Tr has to be at least 4 seconds.

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Accepted Answer

Sean de Wolski
Sean de Wolski on 19 Dec 2012
I don't know of this being possible, but it is certainly a good idea for an enhancement request.
Here is how I would tackle this:
  1. Have the timer only execute once, i.e. 'TasksToExecute' = 1.
  2. In the 'TimerFcn' have it start a new timer with a StartDelay equivalent to your new period.
  3. Finally at the end of the 'TimerFcn', have it delete the timer calling it so you don't end up with hundreds of timers

  2 Comments

Dan
Dan on 15 May 2017
Would be nice to be able to dynamically change the timer period 'on the fly' ...
desire is 'fixed rate' timer within the callback of which I'd like to modify the period to be used for the current period. While changing the period of the current interval is desired, changing the period of the next interval would be acceptable.
In lieu of this enhancement, I'll have to use the 'startat' feature to restart the timer at the appropriate time given the time passed to the callback in the current callback.
Amira chriki
Amira chriki on 16 Apr 2020
Can you please give me more details about how to change the timer's period inside the same timer timerFcn?

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More Answers (1)

Martin Grden
Martin Grden on 7 Oct 2020
TimerFcn(objh,event)
...
% at the end of your TimerFcn:
stop(opjh);
opjh.Period=newPeriod;
opjh.StartDelay=newPeriod;
start(opjh);

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