Passive Buzzer – Create Melodies and Sound Effects with Arduino and PWM Signal

Compact Sound Module for Alarms, Signaling and Interactive Projects

This passive buzzer module is your tool for adding sound and melodies to electronic creations! Unlike active buzzers that emit only a single fixed tone, this passive module is fully controlled by a microcontroller (like Arduino) via a PWM signal. This gives you full creative control – you can generate different pitches, program entire tunes, or create custom sound alerts for alarms and notifications. With its compact size and operating voltage of 3.3V - 5V, it is the perfect choice for educational projects, smart gadgets, toys, or any interactive system that needs to "speak up".

The module is ready to use – it often includes a built-in current-limiting resistor and can be easily connected with jumper wires to your board.

Key Specifications:

• Type: Passive Buzzer (no internal oscillator)

• Operating Voltage: 3.5V - 5.5V

• Operating Current: < 25 mA

• Control: Via external PWM signal (square wave)

• Recommended Driving Frequency Range: 2 kHz – 5 kHz

• Module (PCB) Dimensions: 18.5 mm (L) x 15 mm (W)

• Compatibility: Arduino, Raspberry Pi, ESP8266/ESP32 and other microcontrollers.

Specification:

Working voltage: 3.5-5.5V
Working current: <25mA
PCB Dimension: 18.5mm x 15mm(L x W)

Feature:

No oscillation source, need square wave (frequency 2K-5K ) to drive.
Sound frequency control, you can make a "do re mi fa sol la si" effect.

Package included:

1 x Standard Passive Buzzer Module

reference source programme:

int buzzer=8;// Set the control the buzzer digital IO pin
void setup()
{
pinMode(buzzer,OUTPUT);// Setting the digital IO pin mode , OUTPUT is Wen out
}
void loop()
{
unsigned char i,j;// Define the variable
while(1)
{
for(i=0;i<80;i++)// Wen a frequency sound
{
digitalWrite(buzzer,HIGH);// Sound
delay(1);//delay 1ms
digitalWrite(buzzer,LOW);//Not sound
delay(1);// delay 1ms
}
for(i=0;i<100;i++)// Wen out another frequency sound
{
digitalWrite(buzzer,HIGH);// Sound
delay(2);//delay 2ms
digitalWrite(buzzer,LOW);// Not sound
delay(2);//delay 2ms
}
}
}