On 03/05/17 11:05, Terry Coles wrote:
As I mentioned at last night's meeting, we are currently considering a solution
based on
measuring the air pressure in a pipe that is connected to the bottom of the
butt.
In case you didn't already know, 'digital' versions of these are
available quite easily and probably cheap, or free. They are used in
most if not all washing machines and dish washers. The one I've looked
at recently has a screw for pressure adjustment. You could get hold of
at least two of them (one for "too high" and one for "too low") and
connect them to GPIO pins if exact water height doesn't matter.
If the problem is making sure the water is pumped from the lower tank to
the header tank, but the pump is turned off when the header tank is full
or the lower tank is empty then there's some quite simple ways to do
that. But they don't require a computer so aren't perhaps technical
enough for this list. :)
Also, I wrote my last e-mail before I had looked at the Wimbourne Model
Village web site. I imagined it would be indoors and a lot smaller than
it is!
--
Andrew.
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