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???
10/26/05 17:58
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#102981 - Conductivity?
Responding to: ???'s previous message
Erik Malund said:
Does anyone have idea(s) about "cheap" means of sensing soil deampness?

I suspect that wet soil might be notably more conductive than dry soil. If that's the case, it might be possible to have a simple two probe system, with one probe connected to Vcc and the other connected to the base or gate of a transistor. If the conductivity varies enough, the transistor should be off when the ground is dry, and on when the ground is wet.

That said, does anyone know how soil conductivity varies with moisture content?

--Sasha Jevtic


List of 16 messages in thread
TopicAuthorDate
soil dampness            01/01/70 00:00      
   Conductivity?            01/01/70 00:00      
      Conductivity            01/01/70 00:00      
   addendum            01/01/70 00:00      
      Nutsy idea?            01/01/70 00:00      
      Configuration/calibration            01/01/70 00:00      
         that would not be calibration            01/01/70 00:00      
            humidity            01/01/70 00:00      
      Water for a short while and compare            01/01/70 00:00      
   Another idea            01/01/70 00:00      
   Spatially Distributed Soil Measurements            01/01/70 00:00      
      I needed that            01/01/70 00:00      
         There is Yet Hope            01/01/70 00:00      
   soil dampness            01/01/70 00:00      
      Gypsum block sensor            01/01/70 00:00      
   Capacitance.            01/01/70 00:00      

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