KY-012 Active Piezo-Buzzer

int Buzzer = 13;
 
void setup ()
{
  pinMode (Buzzer, OUTPUT); // Initialize output pin for the buzzer
}
 
void loop () //main program loop
{
  digitalWrite (Buzzer, HIGH); // Buzzer is switched on
  delay (4000); // wait mode for 4 seconds
  digitalWrite (Buzzer, LOW); // Buzzer is switched off
  delay (2000); // Wait mode for another two seconds in which the LED is then turned off
}

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

Raspberry Pi	Sensor
GPIO 24 [Pin 18]	Signal
-	+V
GND [Pin 6]	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.

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

Example program download

KY012-RPi-ON-OFF

To start with the command:

sudo python3 KY012-RPi.py

	
		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
device = Pin(18, Pin.OUT, value=0)

# Switch on buzzer
print("ON")
device.on()

# Wait 3 seconds
print(".")
sleep(1)
print(".")
sleep(1)
print(".")
sleep(1)

# Switch off buzzer
print("OFF")
device.off()