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Lesson 24: Vibration Sensor Module (SW-420)

In this lesson, you will learn how to detect vibrations using a vibration sensor with an Arduino Uno. We’ll explore how the sensor signals the presence of vibrations to the Arduino, triggering it to display a message. This project is perfect for beginners to understand digital input processing and serial communication in Arduino. You’ll gain hands-on experience in reading sensor data and implementing conditional logic in your sketches.

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
Vibration Sensor Module (SW-420)	BUY

Wiring

Code

Code Analysis

1. The first line of code is a constant integer declaration for the vibration sensor pin. We use digital pin 7 to read the output from the vibration sensor.

   const int sensorPin = 7;
   

2. 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
   }
   

3. 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);
   }