from machine import Pin
import utime
from utime import sleep_ms,sleep_us,sleep
pulse=Pin(3,Pin.OUT)
echo=Pin(2,Pin.IN)
buzzer= Pin(19,Pin.OUT)

def ultra():
   pulse.value(0)
   sleep_us(2)
   pulse.value(1)
   sleep_us(5)
   pulse.value(0)
   while echo.value() == 0 :
    signaloff=utime.ticks_us()
   while echo.value() == 1 :
    signalon=utime.ticks_us() 
   timepassed=signalon-signaloff 
   distance=(timepassed*0.0343)/2
   if distance < 50:
    buzzer.value(1)
    utime.sleep_ms(100) 
    buzzer.value(0)
    utime.sleep_ms(100)
    print("Obstacle detected! Distance:", distance, "cm")
   else:
    print("The distance from object is ",distance,"cm")
while True:
   ultra()
   utime.sleep(1)