From: gherold@teachspin.com
On Friday, January 12, 2018 at 11:31:34 PM UTC-5, Jasen Betts wrote:
> On 2018-01-13, George Herold wrote:
> > On Friday, January 12, 2018 at 6:38:44 PM UTC-5, 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.
> >
> > Can you make an oscillator that turns on with higher resistance?
> > (I think I know how to do that.)
> >
> > George H.
>
> Make an oscillaor and then short some critical part out with a
> variable resistor, you'll probably get frequency and/or waveform
> modulation too.
>
> --
> This email has not been checked by half-arsed antivirus software
Well I was thinking of one that turned on when the resistance went up,
I made some probes from SS optical posts. Worked fine. I don't
know what would happen with the system sitting idle (in water)
with DC across the probes.
George H.
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