Re: HA Holy Grail #1: Occupancy Detection

["David Gumbrell" <david.gumbrell@xxxxxxxxx>]

Hi Ian,

Yes, really the issue is one of positioning a sensor (whether it is PIR or
sonar) to get "view" into shower cubicle whilst keeping it out of
the
"zone", or having to meet any necessary IPxxx / SELV
requirements. The Part
P stuff makes me very careful about the installation of automation stuff in
the bathroom, and I'm also trying to avoid the ceiling getting "sensor
rash".  Really, I probably put the main sensor in the wrong place, I
should
have mounted it further into the room and closer to the shower surround and
then there would be no issue.

Cheers,

David


On 8/30/06, ian.bird@xxxxxxx < ian.bird@xxxxxxx> wrote:
>
>   For this shower problem the ultrasonic range sensors would be good.
You
> could mount one on the ceiling and detect when someone was in the
shower.
> The main challenge would be making it showerproof whilst keeping it
> effective. Just a thought
>
> Ian
>
> ---------+---------------------------->
>   "David Gumbrell"
>   <david.gumbrell@g
>   mail.com>
>   Sent by:
>   ukha_d@yahoogroup
>   s.com
>
>
>   29/08/2006 22:17
>   Please respond to
>   ukha_d
>
> ---------+---------------------------->
> >----------------------------------------------------------
>
>  To: ukha_d@xxxxxxx <ukha_d%40yahoogroups.com>
>  cc: (bcc: Ian Bird/CV/Novartis)
>  Subject: Re: [ukha_d] HA Holy Grail #1: Occupancy Detection
> >----------------------------------------------------------
>
> Detecting shower "on" is the tricky part. At the moment I
get reasonable
> off-to-on transition detection using an humidity sensor, but the
on-to-off
> is not so good (shallower curve). I considered a flow sensor, but
seems
> like
> overkill and may reduce the waterflow (and I can't face the plumbing),
so
> probably will just alter the room timeout when shower off-on detected
to
> allow for average shower duration and then reset to shorter when
redetect
> on
> exit from shower cubicle. Or just have a 10 minute time-out :-)
>
> I was planning temperature sensors on the CH pipes anyway, so will
> probably
> add one to the shower hot feed too to sharpen the Off-to-on detection
a
> bit
> further.
>
>
>


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