Water Leak Detector


This is the ultimate low power water detector circuit. Works for detecting rain, floods, etc… and it is sensitive enough to report status of the contact, like if there is still water present or not.

VP2106 MOSFET From Digikey VP2106N3-G-ND

1N5817 Schottky Diode from Digikey 1N5817DICT-ND

I’ve made my own sensors in the past, but these are highly recommended from Amazon


This circuit is actually inverted, so set your detection in the configurator on the “opening” of the contact: