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Looking for a circuit that when you press a button powers th

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jskiba(at)icosa.net
Guest

Posted: Fri Sep 13, 2013 3:28 pm Post subject: Looking for a circuit that when you press a button powers th

Looking for a circuit that when you press a button powers the device but ....if the button is held on it is only powered for a max setting (say 3 seconds) but this same circuit should stop if the button is released before the 3 seconds.



Hope that makes sense, I bet it exists already and I just am searching under the wrong name.



Thanks in advance for the help



Jeff.

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henador_titzoff(at)yahoo.
Guest

Posted: Fri Sep 13, 2013 4:46 pm Post subject: Looking for a circuit that when you press a button powers th

Jeff,

I believe you need a better spec.  For example, you say that when the button is pressed, the device is powered on.  Then you say if the button is released before the 3 second interval, it should stop powering the device.  Or at least that's what I think you said.

I think you need to divide it into the following functions:



If the button is pressed for less than N seconds, function 1 happens
If the button is pressed for more than N seconds, function 2 happens
If the button is held for exactly N seconds, well never mind, there is no such thing unless you have an accuracy spec.  If you do, then function 3 happens.  These three functions need not be mutually exclusive.

 

Whatever functionality you want, I believe a microcontroller or CPLD will do the job.  If you describe your functionality more accurately, including output voltage, current, etc., then this group can recommend specific products, including  boards.

Henador Titzoff

        From: Jeffrey Skiba <jskiba(at)icosa.net>

 To: "aeroelectric-list(at)matronics.com" <aeroelectric-list(at)matronics.com> 

 Sent: Friday, September 13, 2013 7:27 PM

 Subject: Looking for a circuit that when you press a button powers the  device but ....

  

 

--> AeroElectric-List message posted by: Jeffrey Skiba <jskiba(at)icosa.net (jskiba(at)icosa.net)>



Looking for a circuit that when you press a button powers the device but ....if the button is held on it is only powered for a max setting (say 3 seconds) but this same circuit should stop if the button is released before the 3 seconds.



Hope that makes sense, I bet it exists already and I just am searching under the wrong name.



Thanks in advance for the help



Je=   --> http://www.matronics.com/Navigator?AeroElectric-Lista href="http://forums.matronics.com/" target="_blank">http://forums.mat                     &nbs//www.matronics.com/contribution" target="_blank">http://www.matronics.co==================

  

 

  

 [quote][b]

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nuckollsr

Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS

Posted: Fri Sep 13, 2013 6:06 pm Post subject: Re: Looking for a circuit that when you press a button power

Henador's suggestion is doable. There's probably a half dozen approaches to this task. Questions:



How much current do you need to switch?



Can the switch be in the ground side of the load?



Do you mind if a relay is used . . . or is it a design goal

to be all solid state?



You may be able to do this for a few$ of discrete

components  . . . 



Bob . . .

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Sat Sep 14, 2013 6:10 am Post subject: Re: Looking for a circuit that when you press a button power

 	  Quote: 	
		  Looking for a circuit that when you press a button powers the device but ....if the button is held on it is only powered for a max setting (say 3 seconds) but this same circuit should stop if the button is released before the 3 seconds. 

Jeff. 	




The circuit you want is a momentary push button with a resettable fuse. Preferably solid state.

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