print("Hello, ESP32!")


from hc-sr04 import HC-SR04
from machine import Pin,I2C
import time
 
p4 = machine.Pin(6)
servo = machine.PWM(p4,freq=50)
sensor = HC-SR04(trigger_pin=5, echo_pin=18,echo_timeout_us=1000000)
led = led.red(pin=23)
led = led.greem(pin=22)
 
while True:
 distance = sensor.distance_cm()
 print(distance,' cm')
 if (distance<6 and distance>0): # if the sensor detects a vehicle
   servo.duty(70) # the parking barrier rises
   led.duty(70) #led green
   time.sleep_ms(5000)
 else:
   servo.duty(130) #the barrier is lowered
   led.duty(130) # led red