Snow Raindrops Detection Sensor Module Rain Weather Module Humidity For Arduino Relay Control Module Rain Water Sensor Module

The Snow/Raindrops Detection Sensor Module (often FC-37 or YL-83) is a versatile, low-cost sensor ($<$$2-3 USD) used to detect rain, snow, or water levels, suitable for Arduino and relay control. It operates at 3.3V-5V, using a nickel-plated, anti-oxidation, moisture-sensitive board that lowers resistance when wet, triggering digital/analog signals via an LM393 comparator module.

Key Features & Components

• Sensor Board & Module: Separated into a conductive surface board and a separate control module with a potentiometer for sensitivity adjustment.
• Outputs: Features both Digital Output (DO) for direct TTL switching (e.g., triggering a relay) and Analog Output (AO) for measuring rainfall intensity.
• Indicator LEDs: Includes a power LED and a digital output signal LED.
• Compatibility: Directly compatible with Arduino, Raspberry Pi, and other microcontrollers. 

Wiring & Operation

• VCC: Connects to 3.3V or 5V (Arduino 5V pin).
• GND: Connects to the Arduino Ground.
• DO (Digital Output): Connects to a digital pin to receive a LOW signal when rain is detected (and a HIGH signal when dry).
• AO (Analog Output): Connects to an analog pin (e.g., A0) for a variable voltage proportional to the moisture level.
• Relay Interaction: When paired with a 5V/12V Relay Module, it can activate devices like motor-driven roof covers or alarms. 

Common Applications

• Automatic rain alarms and smart weather stations.
• Automated windshield wiper systems.
• Automatic rooftop, window, or skylight closers.
• Smart irrigation control (pausing watering when raining). 

Tips for Use

• Adjust the potentiometer on the module to set the sensitivity threshold.
• The sensor board is best mounted at an angle to allow rain to flow off, preventing false positives.
• The board is corrosion-resistant but should be protected from extreme, long-term submersion.

Package includes:

1 x Rain Sensor

1 x Rain Module

2 x Dupont Cables