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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@BogdanG
I agree it's not trivial project. I used to try many solutions based on water sensors, pumps, etc. It is difficult for many reasons: quality sensors, water distribution systems (especially challanging when you have 30+ plants scattered all over the house), individual requiremets for water of each plants.
Finally I gave up and bought electronic-less solution:
http://www.blumat.at/en/watering-system-for-house-plants.html
It has been working for over 5 years supplying water for over 30 plants.