The Raindrops Detection Sensor Module is a two-board rain sensing system consisting of a 54mm x 40mm x 1.5mm collector board with exposed copper trace grid and a 32mm x 15mm x 9mm driver board with an LM393 voltage comparator, operating from 3.3V to 5V DC with both analog and digital outputs. The rain drop sensor works by measuring resistance across the collector board’s exposed copper grid — when dry, the gaps between traces have very high resistance, but when rainwater bridges these gaps, the resistance drops significantly and is detected as a voltage change.
The rain sensor module’s collector board is mounted outdoors facing upward to catch raindrops directly, while the driver board with the raindrops module’s LM393 comparator typically stays in a protected enclosure connected by wires — keeping sensitive electronics away from direct water exposure while only the simple copper grid faces weather. The rain water sensor’s analog output (AO) provides a graduated reading proportional to how much of the grid is wet, useful for estimating rain intensity, while the digital output (DO) gives a simple threshold-triggered rain/no-rain signal for the rain detector for Arduino interrupt-based wake-up logic.
the automatic rain detector’s exposed copper grid can oxidize over time with repeated wetting, gradually reducing sensitivity — periodic cleaning or eventual collector board replacement maintains accuracy. This StemVolt sensor is well-suited for engineers building automatic rain detection systems and practical weather-responsive electronics projects.
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Features:
- Two-board design separates weather-exposed grid from sensitive electronics
- Resistance-based detection — rain bridges copper traces, lowers resistance
- Analog output for rain intensity, digital output for simple threshold
- LM393 comparator driver board for stable threshold-based switching
- 3.3V to 5V compatible with Arduino, ESP32, and similar boards
Technical specifications:
 Applications:
- Rain Sensor used for Arduino automatic window closing system build
- College project uses rain drop sensor for weather detection demo
- Smart home uses rain sensor module for India automatic awning control
- Agriculture uses rain water sensor for irrigation pump auto-shutoff logic
- Car project uses rain detector for automatic wiper trigger demo
Package includes:
- 1 x Raindrops Detection Sensor Module
Manoj Manchanda –
Reliable store product
Vineet Saxena –
Accurate rain and water detection, making it ideal for IoT projects, automatic rain detectors, weather monitoring systems, and Arduino applications
Shruti Hada –
Delivered in 4 days with safe packaging, and helpful staff provided useful guidance for project integration and sensor setup.