import time
time.sleep(0.1) 
print("hello everyone!")
from machine import pin,time_pulse_us
echo = pin(20.pinout)
trig = pin(21.pinout)
led = pin (8.pinout)
buzzer = pin(17.pinout)
print("connected")
while:
    trig.value(1)
    led.value(1)
    buzzer.value(0)
    time.sleep(1)
    trig.value(0)
    led.value(0)
    buzzer.value(1)
    time.sleep(1)
    duration =distance * 58
    distance =distance/58
    print("water level is high")
print("normal water level")