KY-012 Active Buzzer Module — 5V, Digital Control, Arduino DIY (2-Pack)

KY-012 Active Buzzer Module 5V, Digital Control, Arduino DIY (2-Pack)

$5.92 USD

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KY-012 Active Buzzer Module — 5V Digital Control (2-Pack)

The KY-012 is an active buzzer module that produces a fixed-frequency tone when driven HIGH from any digital GPIO pin. Unlike passive buzzers, the active buzzer contains its own oscillator — no PWM or tone library needed. Simply write digitalWrite(pin, HIGH) to sound the alarm.

Key Specifications

Parameter	Value
Buzzer Type	Active (self-oscillating)
Supply Voltage	5V DC
Control Signal	Digital HIGH (5V) = ON, LOW = OFF
Sound Frequency	~2.3kHz (fixed)
Sound Pressure Level	~85dB @ 10cm
Operating Temperature	−40°C to +80°C
Connector	3-pin (VCC, GND, SIG) or 2-pin
Quantity	2 modules

Active vs Passive Buzzer

Feature	KY-012 Active	Passive Buzzer
Internal Oscillator	✅ Yes	❌ No
Control	digitalWrite HIGH/LOW	tone() / PWM required
Frequency	Fixed (~2.3kHz)	Programmable
Simplicity	Easiest	More flexible

Why Choose KY-012?

Zero-Code Simplicity — One digitalWrite() call sounds the buzzer; no tone library needed
85dB Output — Loud enough for alarms and notifications in noisy environments
Wide Temperature Range — −40°C to +80°C for outdoor and industrial use
Direct GPIO Drive — 5V GPIO current sufficient; no transistor driver needed
Pack of 2 — Spare included for projects or kits

Typical Applications

Arduino alarm and alert systems
Doorbell and notification circuits
Countdown timer audio feedback
Security system intrusion alert
Robot collision warning beeper
Button press audio confirmation

Arduino Example

pinMode(8, OUTPUT);
digitalWrite(8, HIGH); // Buzzer ON
delay(500);
digitalWrite(8, LOW); // Buzzer OFF

FAQ

Q: Can KY-012 be used with 3.3V Arduino/ESP32?
A: The buzzer requires 5V for rated volume. At 3.3V it may sound quieter or not at all. Use a transistor (2N2222, NPN) to drive it from 5V with a 3.3V control signal.

Q: Can I change the frequency of KY-012?
A: No — active buzzers have a fixed internal oscillator. Use a passive buzzer module if variable frequency is needed.