from machine import Pin,PWM
from utime import sleep



led_green = Pin(1, Pin.OUT)
led_yellow = Pin(5, Pin.OUT)
led_red = Pin(9, Pin.OUT)
buzzer = PWM(Pin(13))
buzzer.freq(2000)  
buzzer.duty_u16(0)   
button = Pin(16, Pin.PULL_DOWN)
DistanceSensor_trig = (28, Pin.OUT)
DistanceSensor_echo = (27, Pin.OUT)

while True:
  led_green.value(1)
  sleep(1)
  led_yellow.value(1)
  led_green.value(0)
  sleep(1)
  led_red(1)
  led_yellow(0)
  led_green(0)
  buzzer.duty_u16(32768)
  sleep(1)
  led_red(0)
  led_yellow(0)
  led_green(0)
  buzzer.duty_u16(0)