raspberry gpio tutorial 4..distance measuring using ultrasonic

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python codings

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

trig = 4
echo = 18

GPIO.setup(trig , GPIO.OUT)
GPIO.setup(echo , GPIO.IN)
while 1:
    GPIO.output(trig, True)
    time.sleep(0.0001)
    GPIO.output(trig, False)

    while GPIO.input(echo) == False:
        srt = time.time()
    while GPIO.input(echo) == True:
        fsh = time.time()

    dif = fsh - srt

    #for cm :
    dis_cm = dif/0.000058
    dis_inch = dif/0.000148

    print('distance: {}cm'.format(dis_cm))
    time.sleep(.5)

*********************************************************************************
copy that and paste in your python idle

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