Buzzer: Frequency, Pitch & tone()

Why it’s here

Connect frequency with perceived pitch.

How it works

Frequency counts cycles per second. Doubling the frequency raises the pitch by one octave. Sound is opt-in and begins only after a user gesture; the displayed frequency remains useful with audio muted.

Try it

1. Open this experiment
2. Enable sound and run at 440 Hz. Try 880 Hz next, then return to 440 Hz and compare the pitch.

Connections

• D8 — Piezo signal
• GND — Buzzer return

Example sketch

void setup() {
  pinMode(8, OUTPUT);
}

void loop() {
  tone(8, 440);
}

Check your understanding

Does doubling frequency mean doubling volume?