Lesson 14: Detecting Vibrations with Arduino Using a Vibration Sensor
In this tutorial, we learn how to use a simple vibration sensor module with an Arduino to detect and respond to mechanical vibrations. Unlike motion sensors which detect movement or acceleration, this sensor specifically responds to vibrations—such as knocks, taps, or mechanical impacts. When such vibrations are detected, the module outputs a signal that can be used to trigger other devices.
The sensor has a basic three-pin interface: VCC, GND, and Digital OUT. When a vibration occurs, the digital output pin goes HIGH for a moment. This makes it very easy to interface with the Arduino using a standard digital input pin. In this tutorial, the vibration signal is used to trigger a buzzer, though it can just as easily activate a relay, alarm light, fan, or another actuator for custom projects like anti-theft systems, industrial machines, or notification systems.
The code for this project is very straightforward. It checks for a HIGH signal on the digital pin connected to the sensor. When a vibration is detected, the Arduino responds by sending a HIGH signal to the buzzer (or any other connected device). This minimal logic makes the system highly responsive and efficient for real-time reaction. The tutorial also covers how to debounce false triggers and add delays if needed for stable operation.
This video is part of a hands-on step-by-step Arduino course by Robojax, and is perfect for beginners or intermediate makers who want to experiment with real-world sensor input. All wiring, code, and explanations are clearly shown. Make sure to watch the full video to see it in action, and you’ll find the downloadable code and additional resources below.
📚 Chapters / Sections
[00:00] Introduction
[00:27] Vibration Sensor Explained
[00:38] How It Works (Not Motion, but Vibration)
[00:44] Example Use Cases (Buzzer, Relay, Light, etc.)
[01:05] Hardware Pins and Connection
[01:30+] Wiring Guide
[02:00+] Arduino Code Overview
[03:00+] Live Demonstration
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