#!/usr/bin/python
# -*- coding: utf-8 -*-
import os, sys
# add ../../Sources to the PYTHONPATH
sys.path.append(os.path.join("..","..","Sources"))
from yoctopuce.yocto_api import *
from yoctopuce.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 True:
    print("CO2 :  "+ "%2.1f" % sensor.get_currentValue() + "ppm (Ctrl-C to stop)")
    YAPI.Sleep(1000)
