Rain Drop / Water Detection Sensor Module

A reliable way to detect rain or water presence

This rain drop sensor module is built for weather monitoring, smart irrigation, robotics and automation projects, detecting rain and water droplets with high sensitivity. It uses a two-board design: a separate rain-sensing board with an exposed conductive grid that actually contacts the water, and a control board that processes the raw sensor signal and outputs it in a form a microcontroller can easily read.

It supports both analog and digital output signals, giving flexibility between a simple wet/dry threshold trigger through the digital output, or a more graduated sense of how much moisture is present through the analog output, useful for distinguishing light drizzle from heavier rainfall.

Setup and specifications

A built-in LM393 comparator provides stable performance for the digital output stage, and an onboard potentiometer allows the sensitivity threshold to be adjusted to match local conditions or the specific detection need, whether that's triggering on the very first drops or waiting for more substantial water presence. Operating voltage is 5V, and the module ships with 5 pieces of 20cm Dupont wire, ready to connect directly to a microcontroller without needing to source jumper leads separately.

Because the sensing board is separate from the control board, the more delicate electronics stay protected while only the sensing grid is exposed to actual rain or water contact, which is a sensible design for anything meant to be mounted outdoors.

Who it suits

Anyone building a weather station, an automated irrigation system that should pause watering during rain, or a simple water-leak detector will find this module's dual output options and included wiring a convenient, ready-to-use starting point.

Questions buyers ask

Does it give an analog or digital reading?

Both; it supports analog and digital output signals simultaneously.

What chip handles the digital output?

An onboard LM393 comparator.

Can the sensitivity be adjusted?

Yes, through an onboard potentiometer.