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

Parts Required

You can connect to the module using dupont style jumper wire.

Name		Link
Raspberry Pi Pico		Aliexpress link Amazon Ebay
37 in one sensor kit		Aliexpress link Amazon link
Connecting cables		Aliexpress link Amazon Ebay

 

Schematic/Connection

Pico	SENSOR
GPIO28	S
GND	–

 

Code Examples

Basic example

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()

 

REPL Output

Just for debug

MicroPython v1.17 on 2021-09-02; Raspberry Pi Pico with RP2040
Type “help()” for more information.
>>> %Run -c $EDITOR_CONTENT
ON
Wait for 3 seconds
OFF

Links

https://github.com/getelectronics/rp2040learning/tree/main/Sensor%20Kit/KY-012%20Active%20Buzzer