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Re:A Bluetooth Low Energy (BLE) soil moisture sensor by iancmceachern on Thursday October 20, 2022 @07:44PM (#33282350)
One of these might work for you:

https://m.fr.aliexpress.com/item/32689223035.html?html=stati...

https://www.amazon.fr/Corrosion-Resistant-Capacitive-Moistur...

If not I run www.openagriculturesupply.com amd would love to help find something that does.

Re:A Bluetooth Low Energy (BLE) soil moisture sensor by greggsy on Thursday October 20, 2022 @11:26PM (#33284144)
I have a couple of these hooked into an rpi zero to monitor soil moisture under my house. They work, but wireless would be much better.
Re:A Bluetooth Low Energy (BLE) soil moisture sensor by iancmceachern on Friday October 21, 2022 @12:18AM (#33284456)
I should have linked these for you in the first place. They have a whole ecosystem of sensors that are all wireless.

https://www.seeedstudio.com/SenseCAP-S2105-LoRaWAN-Soil-Temp...