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Lesson 24: Vibration Sensor Module (SW-420)

In this lesson, you’ll learn how to detect vibrations using an ESP32 Development Board and a Vibration Sensor (SW-420). We’ll cover reading digital output from the sensor and using conditional statements to display messages on the serial monitor. When the sensor detects vibration, it will display “Detected vibration…”; otherwise, it will output “…”. This project provides a practical way to grasp digital inputs and serial communication, making it ideal for electronics and programming beginners.

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
Vibration Sensor Module (SW-420)	BUY
Breadboard	BUY

Wiring

../_images/Lesson_24_Vibration_Sensor_Module_esp32_bb.png

Code

Code Analysis

The first line of code is a constant integer declaration for the vibration sensor pin. We use digital pin 25 to read the output from the vibration sensor.
```
const int sensorPin = 25;
```
In the setup() function, we initialize the serial communication at a baud rate of 9600 to print readings from the vibration sensor to the serial monitor. We also set the vibration sensor pin as an input.
```
void setup() {
  Serial.begin(9600);         // Start serial communication at 9600 baud rate
  pinMode(sensorPin, INPUT);  // Set the sensorPin as an input pin
}
```

The loop() function is where we continuously check for any vibrations detected by the sensor. If the sensor detects a vibration, it prints “Detected vibration…” to the serial monitor. If no vibration is detected, it prints “…”. The loop repeats every 100 milliseconds.

void loop() {
  if (digitalRead(sensorPin)) {               // Check if there is any vibration detected by the sensor
    Serial.println("Detected vibration...");  // Print "Detected vibration..." if vibration detected
  }
  else {
    Serial.println("...");  // Print "..." otherwise
  }
  // Add a delay to avoid flooding the serial monitor
  delay(100);
}