I made a self-watering plant container a couple of years ago: a moisture sensor senses the moisture level in the soil. When it gets below the treshold it sends

I made a self-watering plant container a couple of years ago: a moisture sensor senses the moisture level in the soil. When it gets below the treshold it sends a signal to a small pump, which extracts the water from a little container in the pot. I had plans to make a water level sensor so that I would get a SMS when it was time to fill the container, but I never got around it. Arduinos rule, BTW!