from machine  import Pin
import time 

LED_PIN = 3
BUTTON_PIN = 28


buzzer = Pin(LED_PIN, Pin.OUT)
button = Pin(BUTTON_PIN,Pin.IN,Pin.PULL_UP)

while True:
    if not button.value(): 
        buzzer.on() 
        time.sleep(0.5)
    else:
        buzzer.off()   
        time.sleep(0.5)