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#!/usr/bin/python
#+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#|R|a|s|p|b|e|r|r|y|P|i|-|S|p|y|.|c|o|.|u|k|
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#
# ultrasonic_1.py
# Measure distance using an ultrasonic module
#
# Author : Matt Hawkins
# Date   : 09/01/2013

# Import required Python libraries
import time
import RPi.GPIO as GPIO
import requests

# Use BCM GPIO references
# instead of physical pin numbers
GPIO.setmode(GPIO.BCM)

# Define GPIO to use on Pi
GPIO_TRIGGER = 23
GPIO_ECHO = 24

print "Ultrasonic Measurement"

# Set pins as output and input
GPIO.setup(GPIO_TRIGGER,GPIO.OUT)  # Trigger
GPIO.setup(GPIO_ECHO,GPIO.IN)      # Echo

# Set trigger to False (Low)
GPIO.output(GPIO_TRIGGER, False)

# Allow module to settle
time.sleep(0.5)

# Send 10us pulse to trigger
GPIO.output(GPIO_TRIGGER, True)
time.sleep(0.00001)
GPIO.output(GPIO_TRIGGER, False)
start = time.time()
while GPIO.input(GPIO_ECHO)==0:
  start = time.time()

while GPIO.input(GPIO_ECHO)==1:
  stop = time.time()

# Calculate pulse length
elapsed = stop-start

# Distance pulse travelled in that time is time
# multiplied by the speed of sound (cm/s)
distance = elapsed * 34000

# That was the distance there and back so halve the value
distance = distance / 2

print "Distance : %.1f" % distance
distance=str(distance)
requete="http://192.IP du PY:8080/json.htm?type=command&param=udevice&idx=00082001&svalue="+distance
r=requests.get (requete)

# Reset GPIO settings
GPIO.cleanup()

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pi@raspberrypi:~/domoticz/scripts/python$ sudo python ultrasonic_1.py
Ultrasonic Measurement
Distance : 37.0

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pi@raspberrypi:~/domoticz/scripts/python$ sudo python ./ultrasonic_1.py
Ultrasonic Measurement
Distance : 37.8

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pi@raspberrypi:~$ sudo find / -name python
/etc/python
/etc/apparmor.d/abstractions/python
/var/lib/python
/home/pi/domoticz/scripts/python