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Any smart garden hose valve integration?
(lemm.ee)
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For the valve, any garden irrigation valve will do. If you have a DIY shop (sorry, I don't know how're they called, here are Brico) you can buy and ask for suggestions there. If you don't have power at all there well...maybe a latch valve and an EAP32 with deep sleep code can last a few months (I guess, I've never tried that). For the waterproofing, the valve should already be waterproof, for the circuits you can buy an IP 65 electric junction box. Easy? Maybe not, but when it works, it feels good!!! :)