+1 My suggestion: A power supply controls a relay. Power on = relay's normally open contact. Power off = relay's normally closed contact, thus bridging the contacts of a T300. This triggers an...

Use T300 for Water-Alarm ?

see Post #2 - looks like so

@The_civvie I solved this problem by using an S112 as a switch to indicate presence/absence. Geofencing sets this switch. The T110's automation first checks if the status is "absence" and then sends...

@emmesiv Tapo doesn't have anything for that, I already asked. I solved it myself with a T300 water detector, which I repurposed. The T300 has a battery monitor that alerts you when the battery is...

Inside S112 12V-Relais are working. S112 will work with 12V, I just test that, try it.