Long-time lurker here but thought I'd post for the first time since I have some results. I ordered one despite some of the misgivings people have noted. Mine seems to have been working reasonably well the last two weeks with it outside in a container. Had a rainfall over night and humidity spiked along with the rainfall and even showed a heavy spike when the rain came in harder in the middle of the storm. I had a relatively smooth exponential decay drop-off in humidity from about 80% after the storm to 59% today with no rain in between. It looked very much like some of the other sensors I've used, however those other sensors were bluetooth via Tuya hub and I suddenly had updating issues, hence the continued search for inexpensive sensors that would work directly with Hubitat.
I just watered today after a week and I got an instant 100% humidity that dropped off nicely over the last 5 hours. I deliberately watered with warmer water to see how it would affect temperature as well. I just started using WebCoRe in Hubitat to graph, but it seems to only show a max of 1 week results in graphs:
The small little spikes and dips in humidity are 1% spikes, inconsequential when it comes to watering plants outdoors.
I don't know if others are experiencing this, but I find with these capacitive sensors, after any adjusting or reinserting in the soil requires watering well after and not touching it to get the the best results.
My soil mix tends to be composted fir fines/composted fish products with some perlite/sand and/or fine bark mulch.
I've now ordered another 2, since this one seems to be working well enough for my needs and planned automations. Will see how reliable it is over the winter before building out some irrigation rules next spring/summer.
Update: Since graphs only show a week and I can't show the previous humidity curve, this is the graph ~9 hours after watering:
And the 1 Day View:
Update 2:
And the 3 Day View:
