KY-012 Active Piezo-Buzzer

This module contains an active buzzer that immediately generates a sound when it is supplied with voltage. Unlike a passive buzzer, this module does not require an external square-wave voltage to generate a sound. As soon as a voltage of at least 3.3 V is applied to the signal pin, the buzzer automatically generates the necessary square-wave voltage and emits a tone with a frequency of 2.5 kHz.

The buzzer operates in a voltage range of 3.3 V to 5 V and requires a maximum current of 30 mA. It produces a loud sound with a minimum volume of 85 dB, which makes it ideal for applications where a clearly audible acoustic signal is required. This can be useful, for example, in alarm systems, warning systems or as acoustic feedback in various electronic devices.

Technical Data
Operating voltage	3,3 V - 5 V
Maximum current	30 mA
Tone frequency	2,5kHz ± 300 Hz
Minimum sound output	85 dB
Operating temperature	-20 °C - 70 °C
Storage temperature	-30 °C - 105 °C
Dimensions	19 x 15,5 x 11 mm

Pin assignment

Arduino	Sensor
Pin 13	Signal
-	+V
GND	GND

Code-Example

This code example shows how the buzzer can be switched on alternately for four seconds and then switched off for two seconds using a definable output pin.

To load the following code example onto your Arduino, we recommend using the Arduino IDE. In the IDE, you can select the appropriate port and board for your device.

Copy the code below into your IDE. To upload the code to your Arduino, simply click on the upload button.

int buzzer = 13;
 
void setup() {
  pinMode(buzzer, OUTPUT); // Initialization output pin for the buzzer
}

// Main program loop
void loop() {
  // Buzzer is switched on
  digitalWrite(buzzer, HIGH);
  // Wait mode for 4 seconds
  delay(4000); 
  // Buzzer is switched off
  digitalWrite(buzzer, LOW); 
  // Waiting for a further two seconds
  delay(2000);
}

from gpiozero import Buzzer
import time

# Initialize the Buzzer using the BCM pin number
buzzer = Buzzer(24)

print("Buzzer-Test [press CTRL+C to end the test]")

# Main program loop
try:
    while True:
        print("Buzzer 4 seconds on")
        buzzer.on()  # Turn buzzer on
        time.sleep(4)  # Wait for 4 seconds
        print("Buzzer 2 seconds off")
        buzzer.off()  # Turn buzzer off
        time.sleep(2)  # Wait for another 2 seconds

# Cleanup after the program has been terminated
except KeyboardInterrupt:
    print("Test ended by user")
    # gpiozero handles cleanup when the script ends

	
		input.onButtonPressed(Button.A, function () {
		    pins.digitalWritePin(DigitalPin.P1, 1)
		    basic.pause(500)
		    pins.digitalWritePin(DigitalPin.P1, 0)
		})
	

# Load libraries
from machine import Pin
from utime import sleep

# Initialization of GPIO18 as output
buzzer = Pin(18, Pin.OUT, value=0)

# Switch on buzzer
print("KY-012 Buzzer test")
print("Buzzer on")
buzzer.on()

# wait 3 seconds
sleep(3)

# Switch off buzzer
print("Buzzer off")
buzzer.off()