KY-012 Active Buzzer Module

The KY-012 Active Buzzer Module is a simple, reliable sound output breakout board built around a self-driven active buzzer element, designed for seamless compatibility with Arduino, ESP32, ESP8266, Raspberry Pi, and other popular microcontroller platforms. Unlike passive buzzers, the KY-012 contains a built-in oscillator circuit that generates a fixed-frequency tone automatically whenever power is applied — no PWM signal or tone library required.

This makes the KY-012 the ideal choice for applications where a straightforward audible alert is needed with minimal code overhead, including alarm systems, doorbell circuits, error indicators, and event-triggered notifications in DIY electronics projects. Simply drive the signal pin HIGH and the buzzer sounds instantly.

With its compact 3-pin interface — signal, power, and ground — the module is fully breadboard-compatible and integrates effortlessly into both prototyping environments and finished project enclosures. Whether you’re a beginner taking your first steps in electronics or an experienced maker needing a dependable alert component, the KY-012 delivers consistent, no-fuss audio output every time.

Specification:

• Buzzer Type : Active Buzzer (Built-in Oscillator)
• Trigger Type : Low Level
• Operating Voltage : 3.3V – 5V
• Operating Current : <30mA
• Output Frequency : ~2.5kHz (fixed)
• Pins : 3 (Signal, VCC, GND)
• Compatibility : Arduino, ESP32, ESP8266, Raspberry Pi
• PCB Dimensions : 18.5mm × 15mm
• Weight : ~4g