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soil moisture sensor


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6 replies to this topic

#1 cplee

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Posted 02 July 2007 - 09:36 PM

Is there a low cost soil moisture sensor available that will work with the U3?

#2 Frosty

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Posted 04 July 2007 - 05:09 PM

Is there a low cost soil moisture sensor available that will work with the U3?

Watermark Soil Moisture sensor is a resistive sensor, Hobby Boards (nice guy, great service) sells them for $32. Otherwise you can make your own sensor with gypsum, a google search should find some instructions. Be careful with gypsum, it's exothermic - gets very hot when setting, you don't want to have your hands in it.

#3 wave_man

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Posted 19 July 2007 - 05:35 PM

Is there a low cost soil moisture sensor available that will work with the U3?



I seem to remember a Forrest Mims circuit that did that, if you are into homebrew circuit hacking. I will try to track it down if you are still interested.


Let me know if you already got one.

wave_man

#4 wave_man

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Posted 19 July 2007 - 05:37 PM

http://blog.faludi.c...sensor-circuit/

This is actually a better circuit to work with than the original.

It has 0-5VDC output. Nice.

Enjoy your wet dirt!

wave_man

#5 Soil Moisture Guy

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Posted 25 September 2008 - 04:08 PM

There is an extreemly low cost soil moisture sensor which is sold by Vegetronix - www.Vegetronix.com which gives a 0 to 3V output voltage proportional to water content. It is extreemly low power too - can be run with a coin battery. I believe that it costs under $30. In addition, TDR based so it doesn't corrode, and is insensitive to salinity.

The full link is:

http://www.vegetroni...ure-Probe.phtml

#6 nataniel

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Posted 15 August 2013 - 12:45 AM

Why don't you check for one here Microwave Moisture Sensor, do not be bewildered by its name - they produce a wide variety of moisture meters and sensors. The company has got a good reputation as the quality is high and the prices are reasonable. Check it out, I hope it will be useful.



#7 ZRandal

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Posted 24 June 2015 - 03:34 PM

Not sure if you are still looking... 8 years  is a long time... Anyways, I tried looking for the Vegetronix VG400, but I believe it is no longer available. There does appear to be another similar soil moisture sensor (I think it is probably a newer revised version) called the VH400. Anyways, although it doesn't cost under $30 it still is pretty cheap - around $37.

 

Anyways, despite this being a little late, hope this helps!

 

 




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