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???
10/27/05 04:42
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#103005 - humidity
Responding to: ???'s previous message
How about a counter weighted cup? You could use a battery as the weight. Much like the dipping bird novelties with an added flag and optical sensor. The output shuts off power to the valves after the timer so that the time settings are unchanged by a "rain delay". The rain water would cause a tip, evaporation a reset. The sliding weight would combine "how wet do you want it?" with some hysteresis. I realize that this lacks an 8051 but I challenge any micro based solution to have longer battery life :) Terry

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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