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      1 #!/usr/bin/python
      2 # Author: Zion Orent <zorent (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_ppd42ns as upmPpd42ns
     26 
     27 # Instantiate a dust sensor on digital pin D8
     28 myDustSensor = upmPpd42ns.PPD42NS(8)
     29 
     30 
     31 ## Exit handlers ##
     32 # This function stops python from printing a stacktrace when you hit control-C
     33 def SIGINTHandler(signum, frame):
     34 	raise SystemExit
     35 
     36 # This function lets you run code on exit, including functions from myDustSensor
     37 def exitHandler():
     38 	print "Exiting"
     39 	sys.exit(0)
     40 
     41 # Register exit handlers
     42 atexit.register(exitHandler)
     43 signal.signal(signal.SIGINT, SIGINTHandler)
     44 
     45 
     46 notice = ("This program will give readings "
     47 "every 30 seconds until you stop it")
     48 print notice
     49 
     50 while(1):
     51 	data = myDustSensor.getData()
     52 	# we need to sleep for a bit for the data to print out
     53 	time.sleep(.1)
     54 	print "Low pulse occupancy: " + str(data.lowPulseOccupancy)
     55 	print "Ratio: " + str(data.ratio)
     56 	print "Concentration: " + str(data.concentration)
     57