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Piezo Buzzer

Makes beeps and tones straight from a digital pin.

Buy Piezo buzzer · Amazon

How it works

A piezo buzzer turns an electrical signal into sound. There are two kinds: an active buzzer has its own oscillator and just beeps at one pitch when powered, while a passive buzzer needs you to feed it a square wave — the frequency you send sets the pitch.

For melodies use a passive buzzer with the Arduino tone() function, which generates the square wave for you. tone(pin, frequency) plays a note; noTone(pin) stops it.

Pins

+ (signal)
To a digital pin.
− (GND)
To GND.

Ratings

Voltage
3–5 V
Drive
Passive: tone(); active: HIGH = beep

Tips

  • Use a passive buzzer for melodies, an active one for a simple beep.
  • Put a 100 Ω resistor in series to make it quieter.