#https://www.youtube.com/watch?v=e9WXf-wRTNg&t=175s

from machine import Pin
import utime

utime.sleep_ms(200)
print("Hello, Gautam!")
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( "The distance from object is" , distance, "cm") 
while True:
    ultra( ) 
    utime.sleep(1)