print("Hello, Pi Pico")
from machine import Pin 
import utime
trigger = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)
def ultra():
    trigger.low()
    utime.sleep_us(2)
    trigger.high()
    utime.sleep_us(5)
    trigger.low()
    while echo.value() ==0:
          signaloff = utime.ticks_us()
    while echo.value() ==1:
          signalon = utime.ticks_us()
    timepassed = signalon -signaloff
    distance =(timepassed*0.0343)/2
    print("distance is ","cm")
while True:
    ultra()
    utime.sleep(1)