Raindrop Detection (Leaf Wetness) Sensor Module

Description

Circuit Uncle‘s Raindrop Detection Sensor module is available to buy in India online at our website. This module is an easy-to-use and low-cost drop recognition sensor, which could be used detect plant leaf wetness as well. The sensor works through a series of exposed parallel metallic conducting traces on printed circuit board (PCB) (A board on which nickel (Ni) is coated in the form of lines) which produces a voltage or potential drop from when drops form over it. By using microcontrollers (like Arduino) analog to digital converters pins (or Analog input pins) the voltage could be read easily.

Raindrop Detection Sensor module Specifications

• Input Vcc: 5V
• Provide both digital (through LM393) and analog output
• Adjustable sensitivity
• Output LED indicator
• Compatible with Arduino and any other microcontroller
• TTL Compatible
• holes for easy fixing over a fixing board
• 3.2 cm x 1.4 cm x 1.0 cm

The module includes a rain board and a control board i.e., two separate things. It has a power indicator LED and an adjustable sensitivity though a potentiometer. The digital output of the module is based on the LM393 op-amp. The grooved pattern PCB collects the raindrop. As raindrops are over the circuit board, they create paths of parallel resistance and that change the net resistance of the circuit which creates a potential drop and measured via the op-amp. The resistance is inversely related to the amount of water lower i.e., more water amount, the lower the voltage drop. If the sensing PCB is completely dry there will be an output of five volts.

The Raindrop detection sensor module has 4 pins to connect with an Arduino namely VCC, GND, D0, A0, and two more pins to connect to the rain board. The pin configuration and other elements onboard is given in the figure below.

Sample Arduino Code of Rain Buzzer

const int buzzer=7;
int i;
void setup() {

pinMode(buzzer,OUTPUT);
pinMode(2,INPUT);  
}

void loop() {


if(digitalRead(2)==1)
{
  digitalWrite(buzzer,HIGH);
  
}

else
{
  digitalWrite(buzzer,LOW);
  
}


}

Datasheet of Raindrop detection sensor module