import machine
from machine import PWM
import time
import _thread

chave = machine.Pin(13,machine.Pin.IN,machine.Pin.PULL_UP)
buzzer = PWM(machine.Pin(15))


def func():
    while True:
    
        if chave.value() ==1 :
            buzzer.freq(100)
            buzzer.duty(512)
       
        else:

            buzzer.duty(0)
    
        time.sleep(0.2)


_thread.start_new_thread(func,());