#!/usr/bin/env python

import os
import sys
import time
import RPi.GPIO as GPIO

GPIOTrigger = 23
GPIOEcho    = 24

def wait(sec):
  while sec > 0:
    sys.stdout.write(str(sec) + '     r')
    sec -= 1
    time.sleep(1)

def MeasureDistance():
  GPIO.output(GPIOTrigger, True)
  time.sleep(0.00001)
  GPIO.output(GPIOTrigger, False)
  StartTime = time.time()
  while GPIO.input(GPIOEcho) == 0:
    StartTime = time.time()
  while GPIO.input(GPIOEcho) == 1:
    StopTime = time.time()
  TimeElapsed = StopTime - StartTime
  Distance = (TimeElapsed * 34300) / 2
  return Distance
def main():
  STATUS = 0
  try:
    while True:
      Distance = MeasureDistance()
      if Distance > 10.0:
        time.sleep(0.01)
      else:
        if STATUS != 1:
      print("Passing by (%.1f cm)" % Distance)
          import subprocess
          subprocess.call(["/root/rcswitch-pi/send", "10000", "1", "1"])
          wait(5)
          STATUS = 1
        else:
          subprocess.call(["/root/rcswitch-pi/send", "10000", "1", "0"])
          wait(5)
          STATUS = 0

  except KeyboardInterrupt:
    print("Stopped by user")
    GPIO.cleanup()
if __name__ == '__main__':
  # use GPIO pin numbering convention
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(GPIOTrigger, GPIO.OUT)
  GPIO.setup(GPIOEcho, GPIO.IN)
  GPIO.output(GPIOTrigger, False)
  main()

def MeasureDistance():
    StartTime = time.time()
    GPIO.output(GPIOTrigger, True)
    while GPIO.input(GPIOEcho) == 0:
        pass
    # Found the raising front
    StopTime = time.time()
    GPIO.output(GPIOTrigger, False)

try:
        Distance = MeasureDistance()
        while True:
            while Distance > 10.0:
                Distance = MeasureDistance()
                wait(5)
            switch_on()
            while Distance < 10.0:
                Distance = MeasureDistance()
                wait(5)
            switch_off()
    except KeyboardInterrupt:

while Distance > breaking_distance - tolerance:
                Distance = MeasureDistance()
                wait(5)
            switch_on()
            while Distance < breaking_distance + tolerance:
                Distance = MeasureDistance()
                wait(5)
            switch_off()