take a look at capacitive soil moisture sensors.

As you said before, you should be good to go

@gbuico USB to TTL serial is on board on NodeMCU and Wemos. Download ESPEasy mega dev.13 Upload to your NodeMCU using "FlashESP8266.exe" from .zip Upload to NodeMCU Use "....._normal_4096.bin" file Power off - on !!! your NodeMCU ( reconnect USB cable ) Make basic setup: With smart phone or notebook connect to your NodeMCU, which works like wifi acces point now ( name like "ESP_Easy_0" ) If password required - "configesp" Type in browser address 192.168.4.1 wifi setup Set your home wifi access info in config page. You will see actual IP your NodeMCU in your wifi network. Connect to this IP and make basic setup. ( you can set Fixed IP, IP of your Domoticz, etc ) ESPEasy setup

Just a quick additional information. While deeply testing the full functionality, I realized that if the NodeMCU goes out of main power AND the magnetic contact connected to D3 (GPIO 0) is closed, the loaded configuration is lost. I found out that usage of GPIO 0, 2, 15 is deprecated because these pin have a meaning during reboot. For this reason I moved my switch to D0 (GPIO 16) and modified accordingly the sketch of my previous post. Sorry