Adeept_RFID_Learning_Kit_Python_Code_for_RPi/14_distance.py at master · highjynx/Adeept_RFID_Learning_Kit_Python_Code_for_RPi · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
#! /usr/bin/python

#-----------------------------------------------------------
# File name   : 14_distance.py
# Description : measuring the distance.
# Author      : Jason
# E-mail      : jason@adeept.com
# Website     : www.adeept.com
# Date        : 2015/06/12
#-----------------------------------------------------------

import RPi.GPIO as GPIO
import time

def checkdist():
	GPIO.output(16, GPIO.HIGH)
	time.sleep(0.000015)
	GPIO.output(16, GPIO.LOW)
	while not GPIO.input(18):
		pass
	t1 = time.time()
	while GPIO.input(18):
		pass
	t2 = time.time()
	return (t2-t1)*340/2

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(16,GPIO.OUT,initial=GPIO.LOW)
GPIO.setup(18,GPIO.IN)
time.sleep(2)
try:
	while True:
		print 'Distance: %0.2f m' %checkdist()
		time.sleep(0.5)
except KeyboardInterrupt:
	GPIO.cleanup()