from machine import Pin
import utime
trigger = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)
def ultra():
  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 * 0.0340)/2    # 0.0340は音速
  print("The distance from object is ",distance,"cm")
while True:
  ultra()
  utime.sleep(1)