Selfhosted
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ACEIRMC 2set Soil Moisture... https://www.amazon.com/dp/B09JSND12L?ref=ppx_pop_mob_ap_share
They're just resistive electrodes with an analog sense of the conductivity of the soil, which is linearly correlated with moisture. It does this by applying a voltage to one side and sensing the current load to the other probe. This is exactly the same as electroplating, so if you keep them on 100% of the time, one will essentially dissolve in the dirt.
Instead, I run their power through a relay. I turn one relay on, it turns on all three of my sensors, I wait a few seconds, take three reads off each, one second apart, take the avg of each sensor, and record that. You can the save that to a timeseries database and host that locally too. Then plot that with Graphana.
To read the analog values, I use this: HiLetgo 3pcs ADS1115 16 Bit 16... https://www.amazon.com/dp/B07VPFLSMX?ref=ppx_pop_mob_ap_share
Now that you have logs, you can check moisture levels before activating your irrigation.
The next step is I have a set of float sensors in the rain barrel, towards the bottom. If the bottom one indicates empty it activates a solenoid to refill from the tap until the top one indicates full. They're about two inches apart.