dying trees

Started by Jasen Betts January 12, 2018
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,

I placed with a couple of strips of copper tape where they are
unobtrusive wired up an NE555 astable to measure the capacitance, 
(R1=2M2 , R2=100k )  I get 12kHz to 18kHz out depending on the water 
level...

So far so good. 


Now I need to convert that to a voltage so I can feed it to some comparator.


 This is what I came up with.
 
  
   +5v  -+-------------+-------.
         |       100nF |       |  PNP
         +-->|--+     ===    ------
         4.7nF  |      |     /e   \
  in   --||-----+-->|--+--+--      +-------+-- out
5Vpk-pk                   |        |       |
                         r1       r2      === 1uF
                          |        |       |
   0v     ----------------+--------+-------+--

R1 offset - 68K
R2 gain - 47K


+5 is from a 7805, diodes are 1N4148

This seems to work pretty well giving me a couple of volts of range.

but am I doing anything dumb there?


before I take this off breadboard (anctually MDF with staples) and make a permanent
circuit on perf board I might increase the capaitors and reduce the resistors to get
a lower
impedance..

-- 
This email has not been checked by half-arsed antivirus software 
On Friday, January 12, 2018 at 1:01:18 AM UTC-5, 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, > > I placed with a couple of strips of copper tape where they are > unobtrusive wired up an NE555 astable to measure the capacitance, > (R1=2M2 , R2=100k ) I get 12kHz to 18kHz out depending on the water > level... > > So far so good. > > > Now I need to convert that to a voltage so I can feed it to some comparator. > > > This is what I came up with. > > > +5v -+-------------+-------. > | 100nF | | PNP > +-->|--+ === ------ > 4.7nF | | /e \ > in --||-----+-->|--+--+-- +-------+-- out > 5Vpk-pk | | | > r1 r2 === 1uF > | | | > 0v ----------------+--------+-------+-- > > R1 offset - 68K > R2 gain - 47K > > > +5 is from a 7805, diodes are 1N4148 > > This seems to work pretty well giving me a couple of volts of range. > > but am I doing anything dumb there? > > > before I take this off breadboard (anctually MDF with staples) and make a
permanent
> circuit on perf board I might increase the capaitors and reduce the resistors to
get a lower
> impedance.. > > -- > This email has not been checked by half-arsed antivirus software
A frequency to voltage converter? How about a multivibrator? With an AC source you may just be able to measure the water conductivity to know when it's empty. Then you just need a rectifier and low pass... I should try something like that to put in our chlorine dosing tank. (We have well water, chlorine dosing takes out the sulfur.) George H.
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.
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... -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998
On 2018-01-12, rickman <gnuarm.deletethisbit@gmail.com> 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. -- This email has not been checked by half-arsed antivirus software
On 13/01/2018 6:28 AM, Jasen Betts wrote:
> On 2018-01-12, rickman <gnuarm.deletethisbit@gmail.com> 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.
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 <gnuarm.deletethisbit@gmail.com> 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.
On 2018-01-12, Rheilly Phoull <froggins@iinet.net.au> wrote:
> On 13/01/2018 6:28 AM, Jasen Betts wrote: >> On 2018-01-12, rickman <gnuarm.deletethisbit@gmail.com> 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. 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... -- This email has not been checked by half-arsed antivirus software
On 2018-01-13, George Herold <gherold@teachspin.com> 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 <gnuarm.deletethisbit@gmail.com> 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
Jasen Betts wrote on 1/12/2018 5:28 PM:
> On 2018-01-12, rickman <gnuarm.deletethisbit@gmail.com> 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.
Do what at your convenience? Just add the water every day rather than when an alarm goes off. Isn't the tree going to use water at a pretty constant rate? -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998