Simple piezo buzzer example

Components

• 1 x piezo buzzer

• 1 x 1k ohm resistor

• 1 x Arduino Uno

  • 1 x breadboard

  • jumper wires

Setup

Arduino sketch

In this sketch, we use pin 3 for output; you can use any PWM pin (denoted by a ~).

/*

  Melody

 Plays a melody using piezo buzzer on digital pin 9

Written by Shani Mensing, edited by Audrey St. John

From example code in the public domain.

 http://arduino.cc/en/Tutorial/Tone

 */

// the pin we will use for output

#define BUZZER_PIN 3

// notes for the song. A space represents a rest

char song[] = "ccggaag ffeeddc ggffeed ggffeed ccggaag ffeeddc "; 

// the number of notes in the song

int songLength = 48; 

// beats per note

int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };

// speed of song

int tempo = 300;

// convenience notes means we don't need Pitches.h

// names of the notes

char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };

// corresponding tones for C4 - B4, C5 (looked up values from Pitches.h)

int tones[] = { 262, 295, 330, 349, 392, 440, 494, 523 };

// number of notes

int numberConvenienceNotes = 8;

// play the song using the variables: song, songLength, beats

void playSong()

{

  // for each note in the melody:

  for (int noteIndex = 0; noteIndex < songLength; noteIndex++) 

  {

    // if it's a space

    if (song[noteIndex] == ' ') 

    {

      // rest

      delay( beats[noteIndex] * tempo/5); 

    } 

    // otherwise it's the name of a note

    else 

    {

      // play the note at that index for the specified time

      playNote(song[noteIndex], beats[noteIndex] * tempo);

    }

    // pause between notes

    delay(tempo); 

  }

}

// play the tone corresponding to the note name

void playNote(char noteName, int duration) 

{

  // loop through the names

  for (int i = 0; i < numberConvenienceNotes; i++) 

  {

    // if we found the right name

    if (names[i] == noteName) 

    {

      // play the tone at the same index

      tone( BUZZER_PIN, tones[i], duration);

      // don't bother looking through the rest of the names

      break;

    }

  }

}

/**

 * The code in this special method is executed

 * once when the microcontroller is turned on

 * (or the program is uploaded).

 **/

void setup() 

{

  // play the song at the beginning

  playSong();

}

/**

 * The code in this special method is constantly executed

 * after setup has occurred.

 **/

void loop() 

{

  // it will be annoying to constantly hear the melody, 

  // so let's do nothing!

}