Re: Small movement sensors ...

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

thanks, also interesting ... looks like will have to find a way of
dealing with sunlight ... maybe some sort of shading, maybe just a
timer ...

OTOH, maybe they could be used as some sort of sunlight detector ...
'though, maybe a photocell would be better at that !

the other aspect of sunlight that might cause problems, maybe, is
UV ... how would the plastic lens  & casing fare, I wonder ...

Chris


On 29 Jul 2007, at 12:17, Kevin Hawkins wrote:

> I have a sample of some really tiny PIR's here - made from the Napion
> division of Panasonic I believe. I was looking at them for occupancy
> detection a while back.  They are about the size of the end of a biro
> cap but only 10mm long - with wires poking out the bottom.     They
> need
> some more electronics adding as I believe they're just CMOS/TTL level
> output and have other needs too. I can't just find the URL at the
> moment
> but I'll keep looking if you're interested.
> ...found it
>
> http://www.mew.co.jp/ac/e/control/sensor/human/napion/index.jsp
>
> Re Sunlight - yes it can cause problems. Coincidently in a rare for me
> 'early' rising I noticed yesterday that my X10 external PIR was
> sending
> continual triggers between around 6.30 and 8 AM - which is when the
> sun
> rises and catches that corner .  Never seen this before as it's
> logically timed in its actions to bring on the security floods during
> darkness only, but in its new role as a 'visitor announcer' it will be
> problematic.  There isn't a tree/bush in the way so I think it's
> direct
> sun light only.
>
> I also noticed in one of the Clipsal instructions for their external
> 'InfraScan' PIR's they specifically state that they must be sited so
> that sunlight can't enter the sensor directly, including sunrise/
> sunset
> or permanent damage may occur.   These are quite long range devices so
> maybe that has a bearing.
>
>
>    Kevin
>
> , Chris Hunter wrote:
>> in the spirit of HA, before pointing the windows & french
windows of
>> the new house, I ran large straws through the foam between 'frame
&
>> wall, one each side, at about shoulder level ... now the pointing
>> well on the way to being done, I have to decide what to do next !!
>>
>> so 'wondered if anyone knows of any small movement sensors ... 
have
>> to be small (aesthetics, plus the doors over outwards) ... PIRs,
>> maybe ... or perhaps some sort of camera ...
>>
>> btw, do PIRs still work while being bathed in sunshine ?
>>
>>
>> Chris
>>
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