from hcsr04 import HCSR04
from machine import Pin, PWM
import time

sensor = HCSR04(trigger_pin=12, echo_pin=14, echo_timeout_us=1000000)
ledR = Pin(4,Pin.OUT)
ledG = Pin(5,Pin.OUT)

buzzer = PWM(Pin(2), freq=440, duty=512)

def SoundBuz(freq, sleep):
    buzzer.freq(freq)
    buzzer.duty(512)
    time.sleep(sleep)

while True:
  distance = sensor.distance_cm()
  if distance > 200 :
   ledG.value(1)
   ledR.value(0)
   time.sleep(1)
  else :
    ledG.value(0)
    ledR.value(1)
    SoundBuz(440, 0.25)
    time.sleep(1)