RE: PIR's

["Alex Monaghan" <alex@xxxxxxx>]

I'm still lifting floorboards at the moment, so an additional PIR wire is not a problem.

The idea would be to use the PC to determine whether to trigger an alarm event or an X10 action, we have no pets etc... so an empty house should
(hopefully) have no PIR events. Security is an additional benefit of
installing PIR's, the main reason is for HA.

> -----Original Message-----
> From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> Sent: 30 August 2002 16:11
> To: ukha_d@xxxxxxx > Subject: RE: [ukha_d] PIR's
>
>
> Alex,
>
> I went the X10 route about a year ago... and I haven't needed to
> replace the batteries yet (used Duracell). However, these are in
> rooms with very little movement.
>
> With X10, you have the latency problem of sending an X10 message
> before you can act on anything. As such, my goal is to move to
> beam-break + PIR.
>
> In an ideal world, I'd use hard-wired PIRs, in may case, back to
> HomeVision. I guess that a lot hinges on whether you've got
> suitable wiring in place.
>
> Finally, I keep the PIRs for the security system (which ARE
> hard-wired) completely separate from those I use for HA. I can
> cope with HA being unreliable (1 or 2 times a year). I don't want
> the alarm being that unreliable.
>
> Regards,
>
> Mark
>
> -----Original Message-----
> From: Alex Monaghan [mailto:alex@xxxxxxx]
> Sent: 30 August 2002 16:07
> To: ukha_d@xxxxxxx > Subject: [ukha_d] PIR's
>
>
> I'm in the process of rewiring and making the new installation
> X10 & general
> HA ready.
>
> I've been toying with the idea of having PIR's in rooms to
> generate triggers
> so that I can activate lights or even generate an alarm. Not knowing m= uch
> about PIR's (other than they can detect movement and are generally use= d on
> alarm systems), I'm after a bit of advise.
>
> I'm looking at 2 options,
>
> The 1st being the RF based X10 devices, this would be easy to
> detect on a PC
> via the CM12 interface and necessary X10 RF interface, but these are = =A330
> each and 14 of these - big house :-) wouldn't be cheap.
> How long is battery life in these units ?
>
> Alternatively, how easy is it to interface some ordinary burglar
> alarm type
> of PIR's (Maplin, Screwfix etc... have these at =A310 each) to a PC > (it'll be
> running a flavour of UNIX or BSD and a simple bit of software developm= ent
> would be acceptable if needed)
>
> Is it easy to distinguish a small movement from a large movement, for<= BR> > example rolling over in bed or sitting up and getting out of bed
> to go for a
> pee ? If the light came on every time the SWMBO rolled over I'd
> very quickly
> have to start uninstalling the HA stuff :-( but if a there was nice di= mmed
> light route to the bathroom, then some real benefit from HA could be s= een
> and I get to keep my toys :-)
>
> Any suggestions or pointers to web sites ?
>
>
>
> http://www.automatedhome.co= .uk
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