from machine import Pin
import time

Blue_led=Pin(22,Pin.OUT)
Echo=Pin(27,Pin.IN)
Trig=Pin(21,Pin.OUT)

def Ultrasonic_sensor():
  Trig.value(0)
  time.sleep(2)
 
  Trig.value(1)
  time.sleep(1)
  
  Trig.value(0)

  start_time=time.ticks_us()
  stop_time=time.ticks_us()



  while Echo.value==0:

    stop_time=time.ticks_us()

    while Echo.value==1:

      start_time=time.ticks_us()
      Duration=start_time - stop_time
     
      Tdistance=(Duration*0.03432)/2
      print("The object distance detected is", Tdistance,"cm")

while True:

  Ultrasonic_sensor()
  time.sleep(1)

if Tdistance >=100:

  Blue_led.value(1)
  time.sleep(1)

  if Tdistance <=100:
    Blue_led.value(0)
    time.sleep(2)