RE: Contact sensors?

[Paul Gale <groups2@xxxxxxxxxxxxxxxx>]

Yes, that might work - I guess it's getting the right size of magnet
and positioning in the right place.

Where else can you get them from? I'm guessing the strength of field and
hence distance varies with the physical size of the magnet?

Thanks,

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of Rob Iles
> Sent: 20 November 2008 05:44
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Contact sensors?
>
> Reed switch + rare earth magnets? I've got a couple salvaged from an
> old
> HDD, and trust me - they're very strong! - can easily imagine them
> closing a
> reed switch at 50-70 mm!
>
> Apologies in advance if I've missed the point!
>
> R.
>
>
> 2008/11/19 Paul Gale <groups2@xxxxxxx>
>
> >   Hi pete,
> >
> > Thanks but unfortunately the loft was finished some time ago, so
no
> > chance of moving the cable. Not sure how successful it'd be at
the
> top
> > though anyway - may not be particularly sensitive? I know the
holes
> > and fixings you're talking about.
> >
> > Any other ideas anyone?
> >
> > Paul. (Mobile)
> >
> >
> > On 19 Nov 2008, at 14:45, "Pete Church"
> <yahoo@xxxxxxx<yahoo%40petechurch.co.uk>>
> > wrote:
> >
> > > Paul,
> > >
> > >
> > >
> > > If you haven't completely enclosed the Velux yet I would
suggest
> > > putting a
> > > sensor at the top of the window in the cavity above/behind
the
> > > handle where
> > > the motor sits (on an old style non Integra one). There is
also a
> > > grommet/hole to pass the cable through the frame into that
cavity.
> > > Because
> > > of the way the mechanism works for cleaning there is still
> clearance
> > > at the
> > > top of the window even with the window fully rotated.
> > >
> > >
> > >
> > > HTH
> > >
> > >
> > >
> > > Pete
> > >
> > >
> > >
> > > I have 3 large top opening velux windows in my loft and I
ran alarm
> > > cable to the bottom of each. I want to fit a suitable sensor
to
> detect
> > > when the window is open. Trouble is, the way that the window
opens
> for
> > > cleaning (whole window swivels 180deg from the center-ish of
the
> > > window) means that there's no clearance for positioning a
standard
> > > magnetic contact sensor between frame and window.
> > >
> > > What I really need is a contact sensor that can operate
around 50-
> 70mm
> > > ish between the magnet and reed switch. I've not seen
anything like
> > > this with that kind of operating gap.
> > >
> > > Anyone got any ideas or know of suitable sensors ?
> > >
> > > I guess there may be other sensor types that may be suitable
> although
> > > of has to be fairly discreet (some kind of adjustable
proximity
> > > sensor). Adjustable operating distance would be really good
as that
> > > would allow fine-tuning.
> > >
> > > Thanks,
> > >
> > > Paul.
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
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>
>
> --
> Rob Iles
>
> RMIDevelopment
>
> Web: http://www.rob-iles.co.uk/rmidevelopment
> Twitter: http://twitter.com/Rob_Iles
> Skype: rob_iles
> 12seconds: http://12seconds.tv/channel/rmi
>
>
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>
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>
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__________ Information from ESET NOD32 Antivirus, version of virus
signature database 3626 (20081119) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com


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