from machine import Pin, time_pulse_us
import time

trig = Pin(28, Pin.OUT)
echo = Pin(27, Pin.IN)
buzzer = Pin(6, Pin.OUT)

def get_distance():
    trig.value(0)
    time.sleep_us(2)

    trig.value(1)
    time.sleep_us(10)

    trig.value(0)

    duration = time_pulse_us(echo, 1)

    distance = (duration * 0.0343) / 2

    return distance


while True:

    distance = get_distance()

    print("Distance:", distance, "cm")

    if distance > 30:
        print("LOW WATER")
        buzzer.value(1)

    else:
        print("WATER LEVEL OK")
        buzzer.value(0)

    time.sleep(1)