Re: PIR Options

["PatrickLidstone" <patrickl@xxxxxxx>]

--- 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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