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      1 #!/usr/bin/python
      2 # Author: Jon Trulson <jtrulson (at] ics.com>
      3 # Copyright (c) 2015 Intel Corporation.
      4 #
      5 # Permission is hereby granted, free of charge, to any person obtaining
      6 # a copy of this software and associated documentation files (the
      7 # "Software"), to deal in the Software without restriction, including
      8 # without limitation the rights to use, copy, modify, merge, publish,
      9 # distribute, sublicense, and/or sell copies of the Software, and to
     10 # permit persons to whom the Software is furnished to do so, subject to
     11 # the following conditions:
     12 #
     13 # The above copyright notice and this permission notice shall be
     14 # included in all copies or substantial portions of the Software.
     15 #
     16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23 
     24 import time, sys, signal, atexit
     25 import pyupm_mg811 as sensorObj
     26 
     27 # Instantiate an MG811 on analog pin A0, and digital pin D2 with an
     28 # analog reference voltage of MG811_AREF (5.0)
     29 
     30 sensor = sensorObj.MG811(0, 2, 5.0)
     31 
     32 ## Exit handlers ##
     33 # This function stops python from printing a stacktrace when you hit control-C
     34 def SIGINTHandler(signum, frame):
     35 	raise SystemExit
     36 
     37 # This function lets you run code on exit
     38 def exitHandler():
     39 	print "Exiting"
     40 	sys.exit(0)
     41 
     42 # Register exit handlers
     43 atexit.register(exitHandler)
     44 signal.signal(signal.SIGINT, SIGINTHandler)
     45 
     46 # Every tenth of a second, sample the sensor and output it's
     47 # detected CO2 concentration in parts per million (ppm)
     48 
     49 while (1):
     50         print "CO2 concentration in PPM: ", sensor.ppm()
     51 	time.sleep(.1)
     52