Post by thread:[PIC]:Wetness sensor

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}

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 wmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwm || Chuck Mancuso || i AEC Systems i || || spam_OUTaecsysTakeThisOuTmosquitonet.com || {|} Delta Junction {|} || || || {{|}} Alaska {{|}} || || || {((|))} USA {((|))} || || http://www.mosquitonet.com/ || {{{{|}}}} {{{{|}}}}|| || ~aecsys/ || ____|______________________|____|| wmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwm -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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}

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.annapragadaKILLspam@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 > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I would love a copy of it - been looking at making a conductivity probe for measuring parameters of chemical solutions >>> marco.genovesiKILLspamLIBERO.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}

I would appreciate the circuit as well. .....glbKILLspam.....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 > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

A copy for me too, if you please. --Lawrence P.S. What is inox? >>> EraseMEmarco.genovesispam_OUTTakeThisOuTLIBERO.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}

Hi Marco, I want a copy as well, thanks a lot! John {Quote hidden}>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.annapragadaspam_OUThome.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 > > > > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. > > _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Please Marco, send me a copy of the circuit. Thanks, Gaston marco genovesi a icrit : {Quote hidden}> > 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 > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

i'd like a copy too please. Why not post it on piclist.com ??? John {Quote hidden}> -----Original Message----- > From: pic microcontroller discussion list > [@spam@PICLISTKILLspamMITVMA.MIT.EDU]On Behalf Of John Waters > Sent: 29 January 2002 06:18 > To: KILLspamPICLISTKILLspamMITVMA.MIT.EDU > Subject: Re: [PIC]:Wetness sensor > > > Hi Marco, > I want a copy as well, thanks a lot! > John > > >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 > > RemoveMEmadhu.annapragadaTakeThisOuThome.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 > > > > > > > > >-- > >http://www.piclist.com hint: The PICList is archived three different > >ways. See http://www.piclist.com/#archives for details. > > > > > > > _________________________________________________________________ > MSN Photos is the easiest way to share and print your photos: > http://photos.msn.com/support/worldwide.aspx > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body