from machine import pin,time_pulse_us
import untime
    TRIG= pin(20,pin.OUT)
    ECO=pin(21,pin.IN)
    LED=pin(15,pin.OUT)

    while True:
        TRIG.low()
     untime.sleep_us(2)
     TRIG.high()
     untime.sleep_us(10)
     TRIG.low()

     duration=time_pulse_us(ECHO,1)
     distance=(duration*0.0343)/2
     print("Distance:",distance,"cm")
    
     if distance>320;
     LED.on()
     else:
        LED.of()
        untime.sleep(1)