Re: Very sensitive PIR's or DualTech?

["psghome2002" <psghome@xxxxxxx>]

That's interesting - I'll take a look at Maplins.

--- In ukha_d@y..., "PatrickLidstone" <patrickl@t...>
wrote:
> --- In ukha_d@y..., "psghome2002" <psghome@h...>
wrote:
> > My question is - has anyone found a suitable PIR for this task
i.e.
> > triggers really quickly (without too many false detections) and
> > looks good on the wall?
>
> Yes - you can buy just the active part of the PIR from
> Maplins/Farnell. Measures about 1" square, with a domed plastic
> bubble, costs about a fiver, outputs 5V logic. Without any kind of
> fresnell (sp?) lens, they are super sensitive to movement. In
> security applications, the sensor would have a "double
strike"
action
> added to minimise false alarms (and NO/NC contacts + anti-tamper)
> circuits added in addition to the lens. I imagine you don't care
too
> much about false triggers if you are just controlling lights -
> sunlight may be a problem in your pad! Alternatively, look to
> position overhead pointing down to detect heads.
>
> Seems to me there is a scope for a "super PIR" which
includes:
> security PIR, occupancy PIR, camera (ok I know you can get these
> already), dallas temp sensing, possibly light sensing, bi-
directional
> IR and perhaps a minature speaker for announcements. With the
> possible exception of the speaker it should all fit in a
conventional
> PIR housing with no problem. The non-security bits could then be
> multiplexed to save cable...
>
> Patrick