Cheap plant watering sensor

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A detailed instructions of how to design a cheap plant watering sensor from LuckyResistor:

I have a couple of plants in flowerpots and this plants not only like some light, they also need water from time to time. Watering this plants is something I often forget, with sad results. There are ready made solutions for this, but I have some objections with all of them. To be clear: There are really smart products out there – it is absolutely nothing wrong with them. It is just as I like to build my own fan controller, I like to build my own plant watering sensor in my very own fashion.

More info at Luckyresistor.me.

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