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Solar-driven Moisture Detector

Using its two electrodes, formed from two stiff pieces of bare copper wire, the circuit can be stuck into the pot of any plant you want to monitor. As long as the plant isn't thirsty, i.e. the soil in the pot is moist enough, it will just sit there and do nothing at all. But when the soil dries out below a certain threshold (which you can adjust to suit the soil used and the plant being monitored), it starts 'squealing' to tell you it is time to give the poor plant a drink.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update

July 7, 2009.

Due to a printing error, the final text line on page 86 of the UK edition has disappeared. The line should read:

 

is obviously adjustable with P1.

 

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