import machine
import time
 
#buzzer = machine.Pin(13, machine.Pin.OUT)
 
while True:
    buzzer_pin = machine.Pin(13, machine.Pin.OUT)
    buzzer = machine.PWM(buzzer_pin)
    buzzer.freq(1047)
    time.sleep(0.5)
    buzzer.freq(2047)
    time.sleep(0.5)
    buzzer.deinit()