How to Use Buzzer with Arduino: Simple Guide and Example

To use a buzzer with Arduino, connect the buzzer's positive pin to a digital pin (e.g., pin 8) and the negative pin to GND. Use the tone() function to play sounds and noTone() to stop them.

Syntax

The main function to control a buzzer is tone(pin, frequency, duration). Here:

• pin: Arduino digital pin connected to buzzer positive.
• frequency: Sound frequency in Hertz (Hz) to play.
• duration: Optional, how long to play the tone in milliseconds.

Use noTone(pin) to stop the buzzer sound on that pin.

arduino

tone(pin, frequency, duration);
noTone(pin);

Example

This example plays a 1 kHz beep for half a second every second on pin 8.

arduino

const int buzzerPin = 8;

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

void loop() {
  tone(buzzerPin, 1000, 500); // Play 1000 Hz for 500 ms
  delay(1000);               // Wait 1 second
  noTone(buzzerPin);         // Stop sound
  delay(500);                // Wait 0.5 second
}

Output

The buzzer beeps once every second with a half-second sound.

Common Pitfalls

• Connecting buzzer pins incorrectly: positive to Arduino pin, negative to GND is required.
• Using tone() without noTone() can cause continuous sound.
• Not setting the buzzer pin as OUTPUT in setup().
• Using a passive buzzer without tone() will not produce sound.

arduino

/* Wrong: no pinMode set, no noTone used */
const int buzzerPin = 8;

void loop() {
  tone(buzzerPin, 1000); // Plays tone continuously
  delay(1000);
}

/* Right: pinMode set, noTone used */
void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  tone(buzzerPin, 1000, 500);
  delay(1000);
  noTone(buzzerPin);
  delay(500);
}

Quick Reference

Buzzer Control Cheat Sheet:

• tone(pin, freq, duration): Play sound at frequency freq Hz for duration ms.
• noTone(pin): Stop sound on pin.
• Connect buzzer + to Arduino pin, - to GND.
• Set buzzer pin as OUTPUT in setup().

Key Takeaways

Connect buzzer positive to Arduino digital pin and negative to GND.

Use tone(pin, frequency, duration) to play sounds on the buzzer.

Call noTone(pin) to stop the buzzer sound.

Always set the buzzer pin as OUTPUT in setup().

Passive buzzers need tone() to produce sound; active buzzers may only need HIGH/LOW signals.