Re: PIR Options

["psghome2002" <psghome@xxxxxxx>]

Good point Patrick.

I did get a 'bare board' PIR from Maplins - and it did trigger 
quickly. Unfortunately it was fairly ugly but modifying an existing 
PIR is an interesting idea. I guess you need the right PIR design to 
be able to do this successfully (i.e. the new sensor needs 
unobstructed view and can't get in the way of the old one + 
shouldn't use a mirror design).

There still is the problem of the 'X10 lag' though. And nothing is 
going to cure that.

--- In ukha_d@y..., "PatrickLidstone" <patrickl@t...>
wrote:
> --- In ukha_d@y..., "psghome2002" <psghome@h...>
wrote:
> > I trialled a few different PIR's for the same use (there's been
a 
> > lot of discussion about this on here before). I wanted 
the 'perfect 
> > PIR' that had to meet the following criteria:
> > 
> > 1) Quick triggering
> > 2) Stable so as not to give false alarms when used as security
PIR
> > 3) Looks good
> > 4) Ability to turn On/Off LED
> > 5) Interchangeable Lens for wide/curtain mode detection.
> > 
> 
> I think you are trying to do two jobs with one sensor here, which 
is 
> why you haven't been successful.
> 
> Occupancy detection requires quick triggering and immunity to 
false 
> triggers isn't really a requirement.
> 
> Conversely security requirements are for high immunity to false 
> triggers, which with current technology implies longer trigger 
times.
> 
> I think there is a case to be made for using two independent 
sensors, 
> one for each task. There is no reason why these can't be installed
in 
> the same housing. PIR sensors without any fresnel lens are super-
> sensitive to movement, and very compact, making them ideal for 
> occupancy detection type applications. It's my intention to add 
this 
> type of detector to the security PIR housing - I have already 
> successfully modified one housing to include a camera, and am 
> confident that a high WAF triple mode sensor can be achieved 
without 
> too much of a headache.
> 
> 
> Patrick

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