注:以下程序不是标准库，自己写

import machine, time trig = machine.Pin(2,machine.Pin.OUT) echo = machine.Pin(4,machine.Pin.IN)  def distance():     trig.value(1)     time.sleep_us(10)     trig.value(0)     while echo.value() == 0:         pass     while echo.value() == 1:         ts = time.ticks_us()         while echo.value() == 1:             pass         te = time.ticks_us()         tc = te - ts         distance = round((tc*170)/10000, 2)     return distance  while True:     dist = distance()     print('distance:', dist, 'cm')     time.sleep()

在shell终端里可以看到

distance: 213.83 cm
distance: 210.95 cm
distance: 211.36 cm
distance: 211.24 cm
distance: 212.94 cm
distance: 211.46 cm
distance: 212.58 cm
distance: 212.82 cm
distance: 214.42 cm
distance: 215.27 cm
distance: 212.43 cm