Printable Soil Moisture Sensor
by Mothra78, published
Add two nails 50mm long and 3mm diam..
You have a soil mositure sensor you can use to determine if your plant needs watering.
see the link below from gardenbot that tells you how to hook it up to an arduino.
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First I just designed the sensor and have not used it for long periods yet. Worst case I will change the nails (worth 2 cents) and the printed parts.
But if you look at the circuit from gardenbot it allows you to do readings with current flowing in both directions which should cancel the electrolysis.
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Solder each wires to the 3mm nails
Insert both nails in the spacer
Put the cover on the spacer
Sensor is ready to use
Hook up to you favorite controler like an arduino using a voltage flipping style sensor (see connection diagram on gardenbot)
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