RE: Re: Measuring bath water depth

["Rob Wilkinson <H>" <rwilkinson.heglig@xxxxxxx>]

-----Original Message-----
From:       PatrickLidstone
[mailto:patrickl@xxxxxxx] 
Sent:      Monday, August 12, 2002 3:45 PM
To:      ukha_d@xxxxxxx
Subject:      [ukha_d] Re: Measuring bath water
depth

--- In ukha_d@y..., Stuart Grimshaw <stuart@s...> wrote:
> On Monday 12 Aug 2002 1:20 pm, Stuart Poulton wrote:
> > Patrick,
> >
> > I like the idea of this,  be interesting to see if anyone is
able 
to try
> > this.
> >
> > There are of course ustrasound sensors used in robotics
available.
> 
> What about using a capacitence probe? Two strips of metal, the more
water in 
> the tub, the greate/lesser the capacitence. Have a look at 
epanorama.net for 
> more info.

I was interested in ultrasound because it is non-intrusive. Probes in 
the bath are unsightly, are difficult to secure mechanically, have a 
poor SWMBO factor, and, perhaps most importantly, would, I think, be 
unreliable - since most probes rely on the wet-dry factor, resulting 
in false readings in any situation in which the probe starts off from 
anything other than bone dry...

Patrick

I think the easiest way would be to measure the weight of the bath, when
it
reaches a set weight turn off the water.
This could be done by strain gauges under the feet of the bath, not sure
on
how much the sealing and grouting around the bath will affect the
accuracy
though.


Rob 



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