From: gherold@teachspin.com
On Friday, January 12, 2018 at 11:01:13 PM UTC-5, Jasen Betts wrote:
> On 2018-01-12, Rheilly Phoull wrote:
> > On 13/01/2018 6:28 AM, Jasen Betts wrote:
> >> On 2018-01-12, rickman wrote:
> >>> terra wrote on 1/12/2018 3:36 PM:
> >>>> On 01/11/2018 09:32 PM, Jasen Betts wrote:
> >>>>> As is seasonally traditional, we recently had a dying tree in our house
> >>>>> the tree had no roots, the base of the trunk sat in a vesel of water,
> >>>>> and if the water is not kept topped up the tree dies before the end of
> >>>>> festivities.
> >>>>>
> >>>>> So I decided to instrument the plastic vessel to confirm water level,
> >>>>>
> >>>>> ...
> >>>>>
> >>>>> but am I doing anything dumb there?
> >>>>
> >>>> All of it.
> >>>> I just watched Yule Log on TV. Pretty good.
> >>>
> >>> I'm not sure why a gadget is need to measure the water level. A live,
cut
> >>> tree needs to be topped off every day or even twice a day. Just set an
> >>> alarm...
> >>
> >> I'd rather do it at my convenience, and I'm learning stuff, and
> >> justifying the pile of junk.
> >>
> >>
>
> > You can get good results with analogue stuff too, a couple of electrode
> > sensor rods joined to a simple transistor switch.
>
> Trees don't like copper, so that's why I'm using capacitive
> sensing.
Hmm I think the tree is long past the point where a little
copper is going to hurt it much more. :^)
George H.
>
> I am doing analogue stuff. it'll have a analogue meter on it when I'm
> done... (but I'm not going to trim the copper tape to ensure perfect
linearity)
> it'll blinkenlights too. maybe a relay in-case I want to slave a pump...
>
> --
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