[Soekris] How can I get a signal to the outside world?

Shane Spencer shane at bogomip.com
Mon Oct 6 16:37:22 UTC 2003


I was thining more on the lines of using the NPN to short to ground on a relay.. makes it easier for low voltage triggers to
work.. and ust feeding the appropriate +5VDC to a common relay.  I have a board I have made w/ 4 relays on it all controlled by
LED lines for another board..

On Mon, Oct 06, 2003 at 09:03:40AM -0700, Yann Ramin wrote:
> 
> I don't know if the error LED can source enough current to run a relay,
> but if you were to place any random NPN transistor before a relay (tied to
> the Soekris' +5VDC), you should be able to pull this off.
> 
> http://www.allelectronics.com/cgi-bin/category.cgi?category=500200&item=RLY-623&type=store
> 
> Is a +3VDC relay. There are quite a few +5VDC ones for not much money on
> AllElectronics.
> 
> 
> And maybe when lightning strikes, you light up one of these:
> 
> http://www.allelectronics.com/cgi-bin/category.cgi?category=360&item=FSH-5&type=store
> 
> Or maybe not. :)
> 
> 
> 
> 
> 
> >> On Mon, Oct 06, 2003 at 08:53:22AM -0500, Curtis V. Schleich wrote:
> >> > Here is my plan:  I've got a 4521 that rode out a lightning strike.
> >> The power input does not work, but feeding it with POE works fine.
> >> PCMCIA sockets are toast.  I want to use this as a "babysitter"
> >> board for a
> > system
> >> > I've got in a pretty inaccessible place.  I'm using wisp-dist (but
> >> not married to it...) I need to be able to trip a small relay to
> >> interrupt
> > 12VDC
> >> > power to another 4521 for a few seconds.  I'm basically going to use
> >> a
> > ping
> >> > test to see if the other soekris is connected to the head-end via
> >> the
> > 802.11
> >> > card.  If it is not, I want to reboot the other (baby-sat) soekris
> > board.
> >> >
> >> > I've fiddled around to the point that I've got error led control,
> >> and I
> > can
> >> > use that if someone can point me to a relay with a 1-2 VDC coil, or
> >> a circuit diagram that will allow that 2VDC signal to control a
> >> 12VDC
> > supply
> >> > voltage.  I've been working that angle with no luck.  The other idea
> >> is
> > to
> >> > use the GPIO pins, but I've not found a driver for linux (kernel
> >> version 2.4.20, and I can compile if someone can get me source).  My
> >> last resort will be to remove console from COM1, and use it, but I'd
> >> prefer to avoid that approach if possible, mainly because of the
> >> boot sequence and the resulting scenario of having no console (I'm
> >> not even sure I can do that...).
> >> >
> >> > Anyway, any input will be greatly appreciated.  I'll be glad to
> >> share
> > any
> >> > resulting working system with the list.
> >> >
> >> > Thanks, all!
> >> >
> >> > Curtis V. Schleich,
> >> > CCA and CCAonline,
> >> > cvslist (at) ccaonline (dot) com
> >> >
> >> > _____________________________________________________________________
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> 
> 
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