A passive buzzer module generates sound by converting a digital square-wave (often via PWM) applied to the S control pin into audible tones. Connect VCC to your supply and GND to ground, then vary the PWM/toggling on S to change the perceived pitch or patterns.
| Pin | Signal | Description |
|---|---|---|
S |
PWM | Buzzer drive input — apply a PWM/square wave tone signal from the controller |
VCC |
power | Positive supply for the buzzer module, typically connected to 5V |
GND |
ground | Ground reference for the buzzer module and control signal |
| From | To | Wire |
|---|---|---|
board:D9 |
x1:S |
green |
board:5V |
x1:VCC |
red |
board:GND |
x1:GND |
black |
This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.
// Passive Buzzer Module example for Arduino Uno
// Plays a short melody using a PWM/square wave output on D9.
const int BUZZER_PIN = 9;
// Note frequencies in Hz
const int NOTE_C4 = 262;
const int NOTE_D4 = 294;
const int NOTE_E4 = 330;
const int NOTE_G4 = 392;
const int NOTE_C5 = 523;
void playTone(int frequency, int duration) {
tone(BUZZER_PIN, frequency);
delay(duration);
noTone(BUZZER_PIN);
delay(50);
}
void setup() {
pinMode(BUZZER_PIN, OUTPUT);
Serial.begin(9600);
Serial.println("Passive Buzzer Module demo starting...");
}
void loop() {
Serial.println("Playing melody...");
playTone(NOTE_C4, 300);
playTone(NOTE_D4, 300);
playTone(NOTE_E4, 300);
playTone(NOTE_G4, 300);
playTone(NOTE_C5, 600);
delay(1000);
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