from machine import Pin , PWM
from time import sleep

#configure pin
led1 = Pin(18, Pin.OUT)
led2 = Pin(19, Pin.OUT)
led3 = Pin(20, Pin.OUT)

def BuzzFunc():
  buzz = PWM(Pin(21))
  buzz.freq(500)
  buzz.duty_u16(1000)
  sleep(1)
  buzz.duty_u16(0)

def ledBlink(led):
  led.on()
  sleep(1)
  led.off()
  sleep(1)

while True:
  ledBlink(led1)
  ledBlink(led3)
  BuzzFunc()
  ledBlink(led2)
  ledBlink(led3)
  BuzzFunc()

  # led.on()
  # sleep(1)
  # led.off()
  # sleep(1)

  # led2.on()
  # sleep(2)
  # led2.off()
  # sleep(2)