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Lesson 15: Raindrop Detection Module

In this lesson, you will learn how to use a raindrop detection sensor with an ESP32 Development Board. We’ll cover reading digital signals from the sensor when it detects rainwater and displaying this information on the serial monitor. This project provides an engaging way to grasp digital input and output in microcontroller programming, making it ideal for beginners in electronics and coding with the ESP32 platform.

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
ESP32 & Development Board (ESP32 Board)	BUY
Raindrop Detection Module	BUY
Breadboard	BUY

Wiring

../_images/Lesson_15_Raindrop_Detection_Module_esp32_bb.png

Code

Code Analysis

Defining sensor pin

Here, a constant integer named sensorPin is defined and assigned the value 25. This corresponds to the digital pin on the ESP32 Development Board where the raindrops detection sensor is connected.
```
const int sensorPin = 25;
```
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);
}
```
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);
}
```