Controlling a Buzzer with a Push Button using Raspberry Pi Pico

To design a simple digital input-output system using a push button and a buzzer on a Raspberry Pi Pico. The goal is to toggle the buzzer ON and OFF each time the button is pressed.

Buy Raspberry Pi Pico Basic Kit

Items Required:

Raspberry Pi Pico 1
Push Button 1
Buzzer (Piezo or active) 1
Resistor (10kO) 1
Breadboard 1
Jumper Wires As needed
USB Micro B cable 1
Computer with Thonny IDE 1

Connections:

• Button
  • One end to GPIO 4 (Pin 6 on Pico)
  • Other end to GND
  • Pull-up resistor (internal) enabled in code
• Buzzer
  • Positive terminal to GPIO 16 (Pin 21 on Pico)
  • Negative terminal to GND

Connections:

Code:

from machine import Pin
import time

button = Pin(4, Pin.IN, Pin.PULL_UP)
Buzzer = Pin(16, Pin.OUT)
Buzzer_state = False
last_button_state = 1

while True:
    current_state = button.value()
    if last_button_state == 1 and current_state == 0:  
        Buzzer_state = not Buzzer_state  
        Buzzer.value(Buzzer_state)  
        print("Buzzer ON" if Buzzer_state else "Buzzer OFF")  
        time.sleep(0.2)  # Debounce delay

    last_button_state = current_state  
    time.sleep(0.01)  # Polling delay

Download Code:

Result:

• Initially, the buzzer remains OFF.
• Each time the button is pressed and released (detected as a falling edge), the buzzer toggles its state.
• If it was OFF, it turns ON with a sound. If it was ON, it turns OFF.
• The current state (“Buzzer ON” or “Buzzer OFF”) is printed in the console for verification.