Build Your Own Moisture Sensors Using Nails

I’m constantly scouring other peoples projects looking for ideas. Devon’s  PiPlanter – A Plant Growth Automator project cleverly uses nails and the conductivity of water within the soil to measure soil moisture.

The result of planting wild flower seeds this spring in a 16" terracotta pot.

I’ll have to give this a try with the soil in our terracotta pot. We’re finding that the wild flowers we planted are very sensitive to low moisture. For example, we’ve had rain nearly a week straight until 2 days ago. Last night we noticed that the flowers were drooping already! A few pints of water and an hour later they were back to full strength.


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