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Sasha Jevtic
10/26/05 11:58
Read: 719 times
Barrington, Il

#102981 - Conductivity?
Responding to: Erik Malund'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
soil dampness      Erik Malund      10/26/05 11:27      
   Conductivity?      Sasha Jevtic      10/26/05 11:58      
      Conductivity      Andy Neil      10/26/05 14:28      
   addendum      Erik Malund      10/26/05 12:34      
      Nutsy idea?      Craig Steiner      10/26/05 14:07      
      Configuration/calibration      Sasha Jevtic      10/26/05 14:40      
         that would not be calibration      Erik Malund      10/26/05 15:01      
            humidity      Terry Lingle      10/26/05 22:42      
      Water for a short while and compare      Bert Van Den Berg      10/27/05 02:36      
   Another idea      Bert Van Den Berg      10/27/05 13:17      
   Spatially Distributed Soil Measurements      Bruce Bailey      10/27/05 13:51      
      I needed that      Erik Malund      10/27/05 14:32      
         There is Yet Hope      Bruce Bailey      10/27/05 17:20      
   soil dampness      Bruce Revor      10/27/05 17:07      
      Gypsum block sensor      Rob Vassar      10/27/05 21:27      
   Capacitance.      Steve M. Taylor      10/28/05 12:36      

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