helloworld.py
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	#!/usr/bin/python
	# -- coding: utf-8 --
	import os, sys

	# add ../../Sources to the PYTHONPATH
	sys.path.append(os.path.join("..", "..", "Sources"))
	from yocto_api import *
	from yocto_carbondioxide import *


	def usage():
	scriptname = os.path.basename(sys.argv[0])
	print("Usage:")
	print(scriptname + ' <serial_number>')
	print(scriptname + ' <logical_name>')
	print(scriptname + ' any ')
	sys.exit()


	def die(msg):
	sys.exit(msg + ' (check USB cable)')


	errmsg = YRefParam()

	if len(sys.argv) < 2:
	usage()

	target = sys.argv[1]

	# Setup the API to use local USB devices
	if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
	sys.exit("init error" + errmsg.value)

	if target == 'any':
	# retreive any carbonDioxide sensor
	sensor = YCarbonDioxide.FirstCarbonDioxide()
	if sensor is None:
	die('No module connected')
	print("Using: " + sensor.get_module().get_serialNumber())
	else:
	sensor = YCarbonDioxide.FindCarbonDioxide(target + '.carbonDioxide')

	if not (sensor.isOnline()):
	die('device not connected')

	while sensor.isOnline():
	print("CO2 : " + "%2.1f" % sensor.get_currentValue() + "ppm (Ctrl-C to stop)")
	YAPI.Sleep(1000)

	YAPI.FreeAPI()