RAIN WATER DROP SENSOR – KSH 350 at HIMASTORES Mombasa – best electronics in Kenya
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RAIN WATER DROP SENSOR

SKU: HMJ054 Category: Sensors
KSH 350.00
In Stock

Product Description

Rain/Water Drop Detection Sensor Module

High-Sensitivity Weather Monitoring Module for Arduino

This Rain/Water Drop Detection Sensor Module is designed to detect rainfall presence and measure its intensity for weather monitoring and automation projects. It works on the principle of resistance change: when raindrops fall on the sensing board, they create a conductive path between exposed nickel-plated lines, reducing the overall resistance [citation:2][citation:3][citation:7].

Flexible 3.3V to 5V Operation - Compatible with Arduino, ESP32, and other microcontroller boards
Dual Output Modes - Provides both Analog (AO) and Digital (DO) signals for versatile integration

The module is commonly used in smart agriculture, automatic wiper systems, and irrigation controls [citation:7][citation:11].

Technical Specifications

ParameterValue
Supply Voltage3.3V to 5V DC
Board MaterialFR04 doublesided, nickel-plated
Output TypeAnalog (AO) + Digital (DO)
ComparatorLM393
Sensing Area~5.5 x 4.0 cm
PCB Size32 x 14mm

> Connect VCC to 5V, GND to ground. The DO pin provides a digital signal (LOW when rain is detected), while AO gives an analog reading proportional to water intensity

Adjust the potentiometer to fine-tune the digital output threshold sensitivity for your specific environment

## Working Principle

The sensor board contains exposed nickelplated tracks that act as a variable resistor. When dry, resistance is high and the output voltage remains high. When rain falls, water bridges the tracks, reducing resistance and lowering the output voltage the more water, the lower the resistance [citation:2][citation:3].

## Key Features

+LM393 Comparator - Wide voltage comparator provides clean, stable output signal

+Adjustable Sensitivity Onboard potentiometer finetunes the detection threshold

+LED Indicators - Power LED shows status; DO LED triggers when rain exceeds threshold

+NickelPlated Surface Resists oxidation and ensures long-term conductivity [citation:1][citation:6]

# Applications

  1. Weather monitoring and rainfall detection systems
  2. Smart irrigation and automatic plant watering control
  3. Car automatic windshield wiper activation
  4. IoT and smart home rain alert systems
Reliable and CostEffective Affordable sensor for basic rain detection projects
Easy Integration Simple 3.35V interface, compatible with Arduino and Raspberry Pi

√ Supports both analog and digital outputs for flexible use

√ 5x4cm sensing area with mounting holes for easy installation

√ Built-in potentiometer for sensitivity adjustment [citation:1][citation:12]

## Connection Guide

Module PinArduino PinFunction
VCC5VPower supply
GNDGNDGround
DODigital PinDigital output (0/1)
AOAnalog PinAnalog voltage reading

> Use DO for simple rain presence detection, or AO for measuring rainfall intensity

Read AO with analogRead() for variable water detection, values decrease with more water
The sensing board is not fully waterproof - only the exposed surface is treated for moisture resistance

## Troubleshooting

No signal:

  • Check 5V power and GND connection
  • Ensure sensor board is connected to comparator board via Dupont wires
  • Adjust potentiometer to set appropriate threshold

Inconsistent readings:

  • Clean the sensor board surface if it becomes dirty or oxidized
  • Check for stable power supply
  • Avoid placing sensor near strong heat sources