On 21/02/2012 9:40 AM, IVP wrote:
>> I think typical PIRs are going to be too coarse
>
> I've found PIR isn't too bad, and use it for detection at a variety of
> ranges and angles. A bare PIR sensor has quite a short range, a
> couple of hundred mm, which can be substantially increased by a PIR
> Fresnel lens. The style and size of the lens is important wrt detection,
> as the plastic itself is the front-end filter, removing all but heat=20
> infra-
> red, and particular lens patterns are used for particular targets

Hi Joe,
I might revisit the PIR modules.  Finding something sturdy enough as an=20
off the shelf product is the ideal scenario.  We *could* build sensors,=20
but I'd rather not just yet as it's just an idea with no commitment to=20
bulk quantity yet.  If I could buy a ready to go sensor with a cable=20
tail for under $50 in small quantity that would suffice.  If the idea=20
gets up, then we can look at custom made sensors to get the price down.
David...

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___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

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