Arduino Nano ESP32 - Buzzer

In this tutorial, we are going to learn how to program Arduino Nano ESP32 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 Nano ESP32 Piezo Buzzer tutorial

Hardware Preparation

1×Arduino Nano ESP32
1×USB Cable Type-C
1×12V Active Buzzer
1×12V Power Adapter
1×(Optional) DC Power Jack
1×Jumper Wires
1×(Recommended) Screw Terminal Adapter for Arduino Nano

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
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Overview of 12V Active Buzzer

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


Arduino Nano ESP32 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 Nano ESP32 and 12V active buzzer. Arduino Nano ESP32 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 Nano ESP32 - Relay tutorial

Wiring Diagram

The wiring diagram between Arduino Nano ESP32 and 12V Active Buzzer

This image is created using Fritzing. Click to enlarge image

Arduino Nano ESP32 Code

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

/* * This Arduino Nano ESP32 code was developed by * * This Arduino Nano ESP32 code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * */ #define RELAY_PIN D2 // The Arduino Nano ESP32 that connects to relay to control the 12V buzzer // The setup function runs once on reset or power-up void setup() { // initialize digital pin as an output. pinMode(RELAY_PIN, OUTPUT); } void loop() { digitalWrite(RELAY_PIN, HIGH); delay(1000); digitalWrite(RELAY_PIN, LOW); delay(2000); }

Detailed Instructions

  • If this is the first time you use Arduino Nano ESP32, see how to setup environment for Arduino Nano ESP32 on Arduino IDE
  • Connect Arduino Nano ESP32 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 Nano ESP32
  • 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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