RE: [ukha_d] Cheap and small Break Beam circuit ?

[Marcus Warrington <marcus.warrington@xxxxxxxxxx>]

Just wondering if these would be useful for an auto filling bath
scenario. I.e. have one mounted over
the bath (in the ceiling) to detect the water level ?

They certainly sound (pun?)  interesting , let me know if you get
anywhere with them.

Marcus

-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
Behalf Of ian.bird@xxxxxxx
Sent: 13 July 2006 10:36
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Cheap and small Break Beam circuit ?



As always Frank you spot the most interesting products ;-)

I may have to get some to play with as they may be the answer to
the
perennial PIR problem. In my case in my kitchen where PIR's
don't work
very well due to hanging washing, temperature fluctuations and
an L shape.

Ian

"Frank Mc Alinden" <frankmc@xxxxxxx
<mailto:frankmc%40internode.on.net>
>
Sent by: ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
12/07/2006 20:26
Please respond to ukha_d

To: <ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
>
cc: (bcc: Ian Bird/CV/Novartis)
Subject: Re: [ukha_d] Cheap and small Break Beam circuit ?

Hi Marcus

If the break beams involve having the tx and rx on opposite
sides of the
door then maybe consider this little ultrasonic
device........not as cheap

as a beam break but onlt required on side of the door plus a
serial
interface.......
http://www.maxbotix.com/ <http://www.maxbotix.com/>

Gerry Duprey is currently developing a pic micro interface which
will
handle
up to 12 of these and will do an xPL Plugin for it...........Im
going to
use
2 of these to monitor my pond water level and also a water tank
(when i
get
one)..
HTH
Frank

----- Original Message -----
From: "Marcus Warrington" <marcus.warrington@xxxxxxx
<mailto:marcus.warrington%40mis-es.com>
>
To: <ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
>
Sent: Wednesday, July 12, 2006 11:37 PM
Subject: [ukha_d] Cheap and small Break Beam circuit ?

> Having now got all the lights (except the kitchen/Utility) on
X10
> circuits I've now started to think about how to implement
occupancy
> detection. Originally I was going to use ceiling mounted 360
degree PIRs
> but having trailed them I find that they're sensitivity isn't
up to
> detecting someone walk into a space in time to get the light
on (not
> helped by the X10 comms latency). The only way I can get
anywhere near
> is to mount them directly over the entranceway since they
appear to be
> more sensitive directly underneath the sensor. So, next
thought was to
> mount them centrally in the room but then use a break beam
across the
> entranceway (door jam) as a primary trigger. So does anyone
know a small
> simple break beam device or circuit that I could install
across a
> doorway. Needs to be small and sit relatively flush with the
surface
> (the door jams are wood so I can rebate a little bit) and be
easily
> connected to HomeVision.
>
> Marcus
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>