Arduino - Buzzer

In this tutorial, we are going to learn how to program Arduino to control a 12V active buzzer to produce a loud sound. If you want to control 5V active/passive buzzer, please check out this Arduino Piezo Buzzer tutorial

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×12V Active Buzzer
1×12V Power Adapter
1×DC Power Jack
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About 12V Active Buzzer

The 12V Active Buzzer can produce a loud sound, which is suitable for the alarming system.


Arduino 12V Active Buzzer Pinout

12V Active Buzzer usually has two pins:

  • Negative (-) pin (black): needs to be connected to GND of DC power supply
  • Positive (+) pin (red): needs to be connected to 12V of DC power supply

How to Control 12V Active Buzzer

If 12V active buzzer is powered by 12V power supply, it make sound. To control a 12V active buzzer, we need to use a relay in between Arduino and 12V active buzzer. Arduino can control the 12V active buzzer via the relay. If you do not know about relay (pinout, how it works, how to program ...), learn about relay in the Arduino - Relay tutorial

Wiring Diagram

Arduino 12V Active Buzzer Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code

The below code repeatedly turns the 12V active buzzer ON in two seconds and OFF in five seconds,

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #define RELAY_PIN 4 // the Arduino pin that controls the buzzer via relay // the setup function runs once when you press reset or power the board void setup() { // initialize digital pin D4 as an output. pinMode(RELAY_PIN, OUTPUT); } // the loop function runs over and over again forever void loop() { digitalWrite(RELAY_PIN, HIGH); // turn on buzzer 2 seconds delay(2000); digitalWrite(RELAY_PIN, LOW); // turn off buzzer 5 seconds delay(5000); }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • See the 12V active buzzer's state

Code Explanation

Read the line-by-line explanation in comment lines of code!

Video Tutorial

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