The KY-012 Active Buzzer Module is a compact and easy-to-use sound generation module designed for microcontroller projects. Unlike passive buzzers, this active buzzer has a built-in oscillation circuit, meaning it produces a continuous tone when powered—no PWM signal required. It is ideal for alarms, notifications, warning signals, and simple audio feedback in Arduino, STM32, ESP32, and other development platforms. Key Features Active buzzer with built-in oscillator 3-pin interface (Signal, VCC, GND) Simple digital control Loud and clear sound output Compact PCB design Plug-and-play operation Technical Specifications Model: KY-012 Operating Voltage: 3.3V – 5V DC Type: Active buzzer Control Signal: Digital HIGH to activate Interface: 3-pin header Low power consumption Pin Configuration S (Signal) – Digital control input + (VCC) – 3.3V or 5V – (GND) – Ground When the signal pin is set HIGH, the buzzer emits a tone. When set LOW, the buzzer stops. Applications Alarm systems Motion detection alerts Safety warnings Timer notifications Educational electronics projects Embedded system feedback The KY-012 Active Buzzer Module offers a simple and reliable solution for adding sound alerts to your electronic designs without the need for complex signal generation.
