Build a RasberryPI based ultrasonic distance sensing system

RasberryPi pins

Pics of my distance sensing system

Code & running screen-shots

Code

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BOARD)

TRIG = 12
ECHO = 16

GPIO.setup(TRIG, GPIO.OUT)
GPIO.setup(ECHO, GPIO.IN)

GPIO.output(TRIG, True)
time.sleep(0.0001)
GPIO.output(TRIG, False)

while GPIO.input(ECHO) == False:
    start = time.time()

while GPIO.input(ECHO) == True:
    end = time.time()

sig_time = end - start

#cm:
distance = (sig_time * (340 * 100)) / 2

print('Distance: {} cm'.format(distance))

GPIO.cleanup()