from machine imort pin 
import untime 
trigger = pin (27,pin.OUT)
echo = pin(26,pin.IN)
def ultra():
    trigger.low()
    untime.sleep_us(2)
    trigger.high() 
    untime.sleep_us(5)
    trigger.low()
    rom machine import pin 
    import untime 
    trigger =pin (27,pin .OUT)
    echo=pin(26,pin.IN)
    def ultra():
        trigger.low()
        untime.sleep_us(2)
        trigger.high()
        untime.sleep_us(5)
        trigger.low()