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PICList Thread
'[PIC]:Wetness sensor'
2002\01\28@153732 by hadirian

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Hi all,
Has anyone had experience with a cheap soil wetness (moisture) sensor
please.
Something that could give me some rough idea of soil wetness condition.
This is for my home water irrigation project.

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2002\01\28@154745 by Lawrence Lile

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I have messed around with them:

1.  Soil is wierd stuff.  A DC signal in soil will work like a pair of leads
in an electrolyte.  Straight DC soil resistance will change constantly over
time regardless of dryness.  Try sticking your ohmemeter in a bucket of
dirt, and checking it every 15 minutes for a day, it will vary all over the
place.

3. AC signals work better for measuring soil resistance.

4. Some retail soil meters use conductance, rather than resistance.  This
will be a galvanometer across two dissimilar metals.

5. Soil resistance is affected by fertilizer levels (which are ions) as well
as water.

6. Jameco sells a cheap kit that get's you over a lot of these problems
painlessly.

Good luck!

--Lawrence


{Original Message removed}

2002\01\28@213743 by Chuck Mancuso

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At 09:36 1/29/2002 +1300, you wrote:
>Hi all,
>Has anyone had experience with a cheap soil wetness (moisture) sensor
>please.
>Something that could give me some rough idea of soil wetness condition.
>This is for my home water irrigation project.
>

I've used the Watermark, grandular matrix sensor with great results. There
like a gypsum block, but more sensitive in the higher moisture levels. You
can get info. at:
http://www.sowacs.com/sensors/gypsum.html

Hope this helps.

Chuck




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2002\01\29@033734 by marco genovesi

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Ghadirian,
I have only little experience in electronics (only PIC beginner), however I
remeber a little circuit for gardening in a my old hobby electronics
magazine. If I remember right, his "heart" is a CD4060 with other few
components, it's really cheap. The output are a led and/or  a buzzer and the
time delay for the moisture measure is regulated with a trimmer. Battery
life is very long too (months).
The probe are simple little inox sticks and are controlled with AC current
to prevent electrodes polarization.
NB: this sensor is stand-alone. If you want interface it with PIC, you must
modify the circuit, probably.

If you like, I can scan the circuit image and send to you by e-mail.

Bye
Marco



{Original Message removed}

2002\01\29@091413 by Madhu Annapragada

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Marco:
Would you mind sending me the scanned circuit too?
I am thinking of automating the drip irrigation system I currently have.
Thanks for your time and effort.
Madhu
.....madhu.annapragadaKILLspamspam@spam@home.com

Re: [PIC]:Wetness sensor


> Ghadirian,
> I have only little experience in electronics (only PIC beginner), however
I
> remeber a little circuit for gardening in a my old hobby electronics
> magazine. If I remember right, his "heart" is a CD4060 with other few
> components, it's really cheap. The output are a led and/or  a buzzer and
the
> time delay for the moisture measure is regulated with a trimmer. Battery
> life is very long too (months).
> The probe are simple little inox sticks and are controlled with AC current
> to prevent electrodes polarization.
> NB: this sensor is stand-alone. If you want interface it with PIC, you
must
> modify the circuit, probably.
>
> If you like, I can scan the circuit image and send to you by e-mail.
>
> Bye
> Marco

>

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2002\01\29@091942 by Eoin Ross

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I would love a copy of it - been looking at making a conductivity probe for measuring parameters of chemical solutions

>>> marco.genovesispamKILLspamLIBERO.IT 01/29/02 03:37AM >>>
Ghadirian,
I have only little experience in electronics (only PIC beginner), however I
remeber a little circuit for gardening in a my old hobby electronics
magazine. If I remember right, his "heart" is a CD4060 with other few
components, it's really cheap. The output are a led and/or  a buzzer and the
time delay for the moisture measure is regulated with a trimmer. Battery
life is very long too (months).
The probe are simple little inox sticks and are controlled with AC current
to prevent electrodes polarization.
NB: this sensor is stand-alone. If you want interface it with PIC, you must
modify the circuit, probably.

If you like, I can scan the circuit image and send to you by e-mail.

Bye
Marco



{Original Message removed}

2002\01\29@092404 by Batchellor, Gary

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face
I would appreciate the circuit as well.
.....glbKILLspamspam.....pulseinc.com

Re: [PIC]:Wetness sensor


> Ghadirian,
> I have only little experience in electronics (only PIC beginner), however
I
> remeber a little circuit for gardening in a my old hobby electronics
> magazine. If I remember right, his "heart" is a CD4060 with other few
> components, it's really cheap. The output are a led and/or  a buzzer and
the
> time delay for the moisture measure is regulated with a trimmer. Battery
> life is very long too (months).
> The probe are simple little inox sticks and are controlled with AC current
> to prevent electrodes polarization.
> NB: this sensor is stand-alone. If you want interface it with PIC, you
must
> modify the circuit, probably.
>
> If you like, I can scan the circuit image and send to you by e-mail.
>
> Bye
> Marco

>

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2002\01\29@093855 by Douglas Butler

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I build sensors to measure conductivity of seawater, and we have similar
problems with electrolysis etc.  The ultimate way to do it is to
eliminate electrodes by putting a coil in the soil and measuring the
impedance as it is affected by the soil making a shorted loop.  This is
not easy but it gives the best results.

Sherpa Doug

> {Original Message removed}

2002\01\29@095343 by Lawrence Lile

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A copy for me too, if you please.

--Lawrence
P.S. What is inox?

>>> EraseMEmarco.genovesispam_OUTspamTakeThisOuTLIBERO.IT 01/29/02 03:37AM >>>
Ghadirian,
I have only little experience in electronics (only PIC beginner), however I
remeber a little circuit for gardening in a my old hobby electronics
magazine. If I remember right, his "heart" is a CD4060 with other few
components, it's really cheap. The output are a led and/or  a buzzer and the
time delay for the moisture measure is regulated with a trimmer. Battery
life is very long too (months).
The probe are simple little inox sticks and are controlled with AC current
to prevent electrodes polarization.
NB: this sensor is stand-alone. If you want interface it with PIC, you must
modify the circuit, probably.

If you like, I can scan the circuit image and send to you by e-mail.

Bye
Marco



{Original Message removed}

2002\01\29@111842 by John Waters

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Hi Marco,
I want a copy as well, thanks a lot!
John

{Quote hidden}

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2002\01\29@223510 by Gaston Gagnon

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Please Marco, send me a copy of the circuit.
Thanks,
Gaston

marco genovesi a icrit :
{Quote hidden}

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2002\01\30@133748 by John De Villiers
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i'd like a copy too please.

Why not post it on piclist.com ???

John

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