I would love to see a project thread about making this...

I advise you to make a fritzing diagram so we can understand how you connected everything, otherwise it is quite hard.

Thanks @gohan it works perfectly using a digital pin and the door sensor example.

@ronnyandre good, I always suggest to go with commercial product when people are not familiar when working with 220v: safety first!

@mfalkvidd Thanks for the careful and understanding explanation. Of course it makes sense that salt water is more conductive than tap water and distilled water. I will calibrate and map according to the specific soil I will use the sensor with. Thanks :smile: @Yveaux I haven't tried that, but that was a good idea to see if the sensor itself has any issues with the conductivity. One can never completely trust cheap chinese hardware.. :smirk: