from machine import Pin
import utime
trigger=Pin(15,Pin.OUT)
echo=Pin(14,Pin.IN)
buzz=Pin(6,Pin.OUT)
led=Pin(2,Pin.OUT)

while True:
    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 range is  ",distance)
   
    utime.sleep(1)
    
    if(distance>=200):
        buzz.high()
        led.high()
        print("FLOOD ALERT!!!!!!!!  DAM MAY GET OPENED")
    else:
        led.low()