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Lesson 15: Raindrop Detection Module

In this lesson, you will learn how to use a Raindrop Detection Sensor Module with an Arduino. We will see how the sensor detects rain by measuring changes in resistance caused by raindrops completing circuits on its nickel-coated surface.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
Raindrop Detection Module	BUY

Wiring

Code

Code Analysis

1. Defining sensor pin

   Here, a constant integer named sensorPin is defined and assigned the value 7. This corresponds to the digital pin on the Arduino board where the raindrops detection sensor is connected.

   const int sensorPin = 7;
   

2. Setting up the pin mode and initiating serial communication.

   In the setup() function, two essential steps are performed. Firstly, pinMode() is used to set the sensorPin as an input, enabling us to read digital values from the raindrops sensor. Secondly, serial communication is initialized with a baud rate of 9600.

   void setup() {
     pinMode(sensorPin, INPUT);
     Serial.begin(9600);
   }
   

3. Reading the digital value and sending it to the serial monitor.

   The loop() function reads the digital value from the raindrops sensor using digitalRead(). This value (either HIGH or LOW) is printed to the Serial Monitor. When raindrops are detected, the serial monitor will display 0; when no raindrops are detected, it will display 1. The program then waits for 50 milliseconds before the next reading.

   void loop() {
     Serial.println(digitalRead(sensorPin));
     delay(50);
   }