soil moisture sensor

Discussion in 'The Projects Forum' started by sibghat, Dec 9, 2010.

  1. sibghat

    Thread Starter New Member

    Dec 9, 2010
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    i want to make soil moisture sensor....plz suggest me circuit diagram n abt probes....plz help
     
  2. wayneh

    Expert

    Sep 9, 2010
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    I've seen these for less than $4 at the local hardware store. Is there a reason you want to build your own?
     
  3. sibghat

    Thread Starter New Member

    Dec 9, 2010
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    yeah i hv to make a project n connect sprinkler to them ,.....so that v use optimum water required for plants
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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  5. sibghat

    Thread Starter New Member

    Dec 9, 2010
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    why capaictance is prefred over resistance?????which one is cheap and accurate???
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    Are you referring to relative humidity sensors? The soil moisture probes mentioned so far are resistive.

    The worst thing about the homemade ones is that each one's response may be a bit different, so they may all need to be calibrated before really accurate usage.
     
  7. bertus

    Administrator

    Apr 5, 2008
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