from machine import Pin, PWM
from time import sleep

# Set Buzzer Pin
buzzer = PWM(Pin(13))

while True: 
    buzzer.freq(1000)
    buzzer.duty_u16(32768)#turn On
    sleep(1)
    buzzer.duty_u16(0)#turn On
    sleep(1)

    buzzer.freq(1330)
    buzzer.duty_u16(32768)#turn On
    sleep(1)
    buzzer.duty_u16(0)#turn On
    sleep(1)

    buzzer.freq(100)
    buzzer.duty_u16(32768)#turn On
    sleep(1)
    buzzer.duty_u16(0)#turn On
    sleep(1)