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17. 三月 2026

Using a Piezo Buzzer — SIK Circuit 11

Play a song with a piezo buzzer! Learn about the tone() function, musical frequencies, arrays for storing melodies, and how to create your own tunes.

说明

Parts & Introduction

A piezo buzzer converts electrical signals into sound. Using Arduino's built-in tone() function, you can play specific musical frequencies. This sketch plays a simple melody using character arrays for notes and integer arrays for timing.

Parts Needed

1x Arduino Uno + USB cable
1x Breadboard
1x Piezo Buzzer
3x Jumper Wires

Note Frequency Reference

Note	Freq
c	262 Hz
d	294 Hz
e	330 Hz
f	349 Hz
g	392 Hz
a	440 Hz
b	494 Hz
C	523 Hz

此步骤所需材料：

SparkFun Inventors Kit - V3.21 套件

Arduino Uno R31 个

Breadboard1 个

Piezo Buzzer1 个

Jumper Wires2 个

所需工具：

Computer with Arduino IDE

Hardware Hookup

Wiring Instructions

Place the piezo buzzer in the breadboard. It has two pins — one marked with "+".
Connect the positive pin (+) to Arduino Digital Pin 9 (PWM).
Connect the negative pin to GND.

Tip: If the buzzer doesn't fit easily, try rotating it slightly to align with diagonal breadboard holes.

此步骤所需材料：

Piezo Buzzer1 个

Breadboard1 个

Jumper Wires2 个

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

piezo_buzzer.inoarduino

/*
SparkFun Inventor's Kit
Example sketch 11 — BUZZER

Use the buzzer to play a song!

Hardware connections:
  Buzzer positive pin (+) to digital pin 9 (PWM)
  Buzzer negative pin to GND

This code is completely free for any use.
*/

const int buzzerPin = 9;

const int songLength = 18;

char notes[] = "cdfda ag cdfdg gf ";  // space = rest

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

int tempo = 113;

void setup()
{
  pinMode(buzzerPin, OUTPUT);
}

void loop()
{
  int i, duration;

  for (i = 0; i < songLength; i++)
  {
    duration = beats[i] * tempo;

    if (notes[i] == ' ')
    {
      delay(duration);
    }
    else
    {
      tone(buzzerPin, frequency(notes[i]), duration);
      delay(duration);
    }
    delay(tempo/10);
  }

  while(true){}  // Play once, then stop. Remove this line to loop.
}

int frequency(char note)
{
  int i;
  const int numNotes = 8;

  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523};

  for (i = 0; i < numNotes; i++)
  {
    if (names[i] == note)
    {
      return(frequencies[i]);
    }
  }
  return(0);
}

此步骤所需材料：

Arduino Uno R31 个

所需工具：

Computer with Arduino IDE

Test & Experiment

What You Should See

You won't see anything — but you'll hear a melody playing from the buzzer! The song plays once and stops.

Troubleshooting

No sound: The buzzer pins are easy to misplace on the breadboard. Double-check placement and make sure both pins have good contact.
Want it to stop: Pull the buzzer out while working on other things, plug it back in to test.