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TPYBoard v202

超声波模块（HC-SR04）

from machine import Pin

import time

Trig = Pin(5,Pin.OUT)

Echo = Pin(4,Pin.IN)

while True:

    Trig.value(1)

    time.sleep_us(20)

    Trig.value(0)

    while(Echo.value()==0):

        Trig.value(1)

        time.sleep_us(20)

        Trig.value(0)

    if(Echo.value()==1):

        ts=time.ticks_us()

        while(Echo.value()==1):

            pass

        te=time.ticks_us()

        tc=te-ts

        distance=(tc*0.034)/2

        print('Distance:',distance,'cm')

    time.sleep(2)