ezBuzzer Library - Melody Example

This example uses a piezo buzzer:

Plays a melody once on background each time a button is pressed
Stops playing a melody when another button is pressed
Without using delay() function, this is a non-blocking example

Hardware Required

1	×	Official Arduino Uno
1	×	Alternatively, DIYables STEM V3, Fully Compatible with Arduino Uno R3
1	×	USB 2.0 cable type A/B (for USB-A PC)
1	×	USB 2.0 cable type C/B (for USB-C PC)
1	×	3-24V Active Piezo Buzzer
1	×	Active Piezo Buzzer Module
1	×	Passive Piezo Buzzer Module
1	×	Breadboard
1	×	Jumper Wires
1	×	Recommended: Screw Terminal Block Shield for Arduino Uno
1	×	Recommended: Breadboard Shield for Arduino Uno
1	×	Recommended: Enclosure for Arduino Uno
1	×	Recommended: Prototyping Base Plate & Breadboard Kit for Arduino UNO

Disclosure: Some links in this section are Amazon affiliate links. If you make a purchase through these links, we may earn a commission at no extra cost to you.
Additionally, some links direct to products from our own brand, DIYables .

About Piezo Buzzer and Button

If you do not know about piezo buzzer and button (pinout, how it works, how to program ...), learn about them in the following tutorials:

About ezBuzzer Library

Refer to Arduino - ezBuzzer Library Reference

Wiring Diagram

Arduino Code

Quick Steps

Install ezBuzzer library. See How To
Connect Arduino to PC via USB cable
Open Arduino IDE, select the right board and port
On Arduino IDE, Go to File Examples ezBuzzer Melody example

/* Created by ArduinoGetStarted.com This example code is in the public domain Tutorial page: https://arduinogetstarted.com/library/arduino-melody-example Library References: https://arduinogetstarted.com/tutorials/arduino-buzzer-library This example uses a piezo buzzer: + plays a melody once on background each time a button is pressed + stops playing a melody when another button is pressed + without using delay() function, this is a non-blocking example */ #include <ezBuzzer.h> // ezBuzzer library const int START_BUTTON_PIN = 7; const int STOP_BUTTON_PIN = 8; const int BUZZER_PIN = 3; int lastStartButtonState = HIGH; // the previous state from the input pin int lastStopButtonState = HIGH; // the previous state from the input pin ezBuzzer buzzer(BUZZER_PIN); // create ezBuzzer object that attach to a pin; // notes in the melody: int melody[] = { NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_G5, NOTE_C5, NOTE_D5, NOTE_E5, NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_D5, NOTE_D5, NOTE_E5, NOTE_D5, NOTE_G5 }; // note durations: 4 = quarter note, 8 = eighth note, etc, also called tempo: int noteDurations[] = { 8, 8, 4, 8, 8, 4, 8, 8, 8, 8, 2, 8, 8, 8, 8, 8, 8, 8, 16, 16, 8, 8, 8, 8, 4, 4 }; void setup() { Serial.begin(9600); pinMode(START_BUTTON_PIN, INPUT_PULLUP); pinMode(STOP_BUTTON_PIN, INPUT_PULLUP); } void loop() { buzzer.loop(); // MUST call the buzzer.loop() function in loop() int startButtonState = digitalRead(START_BUTTON_PIN); int stopButtonState = digitalRead(STOP_BUTTON_PIN); if (lastStartButtonState == HIGH && startButtonState == LOW) { Serial.println("The START button is pressed"); if (buzzer.getState() == BUZZER_IDLE) { int length = sizeof(noteDurations) / sizeof(int); buzzer.playMelody(melody, noteDurations, length); // playing } } if (lastStopButtonState == HIGH && stopButtonState == LOW) { Serial.println("The STOP button is pressed"); if (buzzer.getState() != BUZZER_IDLE) { buzzer.stop() ; // stop } } lastStartButtonState = startButtonState; lastStopButtonState = stopButtonState; }

Click Upload button on Arduino IDE to upload code to Arduino

Press and release the START button, You will hear "Jingle Bells" song
Press and release the STOP button, The song is stopped immediately

If you do not press STOP button, the song will be played to the end of song.

Code Explanation

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

※ NOTE THAT:

Important: Buzzer Configuration

This example uses the following buzzer configuration:

Buzzer Type: BUZZER_TYPE_PASSIVE (passive buzzer for melody playback)
Active Level: HIGH (buzzer sounds when pin is HIGH)

Note: Melody playback requires a passive buzzer because it needs to generate different frequencies. If you only have an active buzzer, you can only use the beep functionality (see Beep example).

Please check your buzzer specifications and adjust the constructor accordingly:

If you have an active LOW passive buzzer, use: ezBuzzer buzzer(BUZZER_PIN, BUZZER_TYPE_PASSIVE, LOW);