Re: Contact sensors?

["Rob Iles" <rob.iles@xxxxxxxxx>]

FANTASTIC site - cheap too!

That's my xmas wish list sorted :)



2008/11/20 Steve Morgan <smorgo@xxxxxxx>

>   Warning, this site contains geek p@rn:
>
> http://www.mutr.co.uk/product_info.php?products_id=8568
>
> Steve Morgan
>
>
> -----Original Message-----
> From: ukha_d@xxxxxxx <ukha_d%40yahoogroups.com> [mailto:
> ukha_d@xxxxxxx <ukha_d%40yahoogroups.com>] On Behalf Of
> Paul Gale
> Sent: 20 November 2008 08:15
> To: 'ukha_d@xxxxxxx <%27ukha_d%40yahoogroups.com>'
> Subject: RE: [ukha_d] Contact sensors?
>
> 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 <ukha_d%40yahoogroups.com> [mailto:
> ukha_d@xxxxxxx <ukha_d%40yahoogroups.com>] On Behalf
> > Of Rob Iles
> > Sent: 20 November 2008 05:44
> > To: ukha_d@xxxxxxx <ukha_d%40yahoogroups.com>
> > 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<groups2%40siliconpixel.com>
> >
> >
> > > 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><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
> >
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>



--
Rob Iles

RMIDevelopment

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