A Raspberry Pi Pico and KY-012 Active Buzzer

In this article, we connect a KY-012 Active Buzzer to a Raspberry Pi Pico, any Rp2040 type board will be suitable. We actually tested this with a Cytron Maker Pi Pico

We will use Micropython for these examples but of course you can use the Arduino IDE as well if you have Raspberry Pi Pico support enabled

The KY-012 active piezo buzzer is a 3-pin module that creates an audible sound at 2.5 kHz without the need for pulse width modulation. The only requirement is to set the signal pin to HIGH.

You only need to connect 2 of the pins.

• Min/Max Operating Voltage +3.3V to +5V
• Maximum Current: 30mA
• Resonance Frequency: 2500Hz ± 300Hz continous
• Minimum Sound Output 85Db @ 4in (10cm)
• Storage Temperature: -22°F to  221°F (-30°C to  105°C)
• Operating Temperature: -4°F to 158°F (-20°C to 70°C)

The sensor looks like this

from machine import Pin
from utime import sleep

# Initialization of GPIO28 as output
buzzer = Pin(28, Pin.OUT, value=0)

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

# Wait 3 seconds
print("Wait for 3 seconds")
sleep(3)

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