RE: Sensor

["Harrison, Mark (Alliance)" <mark.harrison@xxxxxxx>]

Can you resolve the problem "when someone is in the bath" to
"when the bath
is full of anything."

If so, you don't want an electrical water sensor. You want an optical one.

The (directional) emitter would sit at the top of the bath at one end. The
receiver would sit at the bottom of the bath at the other, behind a clear
window.

When the bath was empty, the emitter would hit the receiver.
When the bath was full of Steve, the emitter would be blocked.
When the bath was full of water, the refraction would mean that the emitter
would miss the receiver.

I'm sure you could make these things very small, at least the parts of the
them that needed to be visible through the bath, rather than hidden
behind/under it.

Mark

-----Original Message-----
From: Steve [mailto:steve@xxxxxxx]
Sent: 02 August 2000 08:08
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Sensor


That one did cross my mind. I dont like the thought of wires in my bath
might give the wife an idea!

Cant think of any to add water level sensors with out been unsightly.

----- Original Message -----
From: "Julian Driver" <julian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: 02 August 2000 7:37 AM
Subject: Re: [ukha_d] Sensor


> In message <014301bffbeb$73336e60$0100a8c0@xxxxxxx>, Steve
<steve@xxxxxxx>
> writes
> >Hi,
> >
> >I have PIR's in most rooms, controlling the heating zoned into one
for
each
> >of the three floors. With my own software monitoring movements and
then
> >trying to intellegently work out a heating schedule doing away
with a
timer
> >altogether. The PIR's can also be used for the obvious - security.
> >
> >Now for my question. I want to detect when the bathroom is
occupied to
crank
> >up the mechanical ventillation and raise the temp a few degrees. A
PIR
will
> >be of little use detecting my 16 stone mass when there is little
movement
> >when i am in the tub.
> >
> >Can anyone recommend a suitable sensor ?
> >
> >
> >Steve.
> >
> Water level?     ;)))
> --
> Julian Driver
>
>
>
>







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