Re: Newbie questions about PIRs and motion detection

["Dan Khan \(Work\)" <dhk@xxxxxxx>]

Excellent - Thanks once again for the speedy response.

So, if I understand correctly - you have both Wireless hawkeye sensors that
seem to be okay with (small) pets, and normal hard-wired sensors that wire
back to HV.

I don't yet have a HV so am wondering if this is my case for buying one...

Are your wall warts all plugged in centrally and the power distributed from
them using the alarm cable to each PIR?  How are you distributing your
power
to the 8 PIRs and what voltage is the wall wart set to?

Are you suggesting that it is okay to run the 12V along the same piece of
CAT5 as the PIR signals?

Thanks for the help.

-Dan

----- Original Message -----
From: "Kenneth Watt" <kennwatt@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, January 12, 2002 5:50 PM
Subject: RE: [ukha_d] Newbie questions about PIRs and motion detection


>
>
> > -----Original Message-----
> > From: Dan Khan (Work) [mailto:dhk@xxxxxxx]
> > Sent: 12 January 2002 17:46
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] Newbie questions about PIRs and motion
detection
> >
> > I am considering putting in some PIRs for motion sensing in a
> automation
> > and
> > security context.  I am most definitely a PIR and security
thicky.
> >
> > I cannot find any pet-immune wireless PIRs such as the MS13e
Hawkeye
> and
> > thus may have to consider a hard-wired solution to avoid my 6
cats
> > triggering false detects.
> >
> [Kenneth Watt]
>
> I have three of them Dan and they work well with small dogs so cats
> should be fine.
>
> > I see there is a pet-immune PIR on letsautomate - how are these
things
> > normally wired up?  Can I attach a piece of CAT5 from it back to
a
> central
> > location, then connect it up to a controller (either alarm, or
> homevision,
> > or similar?).  The PIRs seem to work on DC voltage 9-16V - how is
the
> > power
> > normally routed to the PIR?
> [Kenneth Watt]
>
> Power fed from a wall wart set to 12V DC in my case, then the relay of
> the PIR connected to HV.
>
> Does an extra power cable have to be run to
> > hold the power or can the power and signals be routed down the
same
> piece
> > of
> > CAT5?
> [Kenneth Watt]
>
> Easier just to use alarm cable, although CAT5 is fine and leaves you a
> pair of wires spare, just in case!
>
>
>   Where would the power come from to power all these PIRs (say I
> > installed one in each room so prob 13-15 locations)?  Is there
any way
> > that
> > I can trigger an X10 event when the PIR is triggered then reset?
> [Kenneth Watt]
>
> Very easily. Power can be supplied from a couple of wall warts or
> suchlike, you could even use a wall wart with a higher amperage and
> power them all from one. But, IME, this is not necessary as they do
not
> consume a lot of power, I have eight powered at the moment from one
bog
> standard wall wart.
>
> >
> > Is it recommended to route all PIR cabling back to a central box
> (similar
> > to
> > those Krone connecting blocks that James Hoye installed mentioned
a
> few
> > months back) and then connect the central controller to this
using
> "patch
> > leads".
> [Kenneth Watt]
>
> IMO, no, I did not find this was needed although it may be neater.
>
> >
> > Is installing the hard-wired PIRs a DIY job or something a bit
more
> > serious...
> [Kenneth Watt]
>
> Doddle! Very easy to hook up to HV, just the cable runs that can p**s
> you off ;-)
>
> K.
>
> HTH
>
>
>
>
>
>
> For more information: http://www.automatedhome.co.uk
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