Home | History | Annotate | Download | only in python 
      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_gas as upmGas
     26 
     27 # Attach gas sensor to AIO0
     28 myMQ3 = upmGas.MQ3(0)
     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 myMQ3
     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 threshContext = upmGas.thresholdContext()
     47 threshContext.averageReading = 0
     48 threshContext.runningAverage = 0
     49 threshContext.averagedOver = 2
     50 
     51 # Infinite loop, ends when script is cancelled
     52 # Repeatedly, take a sample every 2 microseconds;
     53 # find the average of 128 samples; and
     54 # print a running graph of dots as averages
     55 mybuffer = upmGas.uint16Array(128)
     56 while(1):
     57 	samplelen = myMQ3.getSampledWindow(2, 128, mybuffer)
     58 	if samplelen:
     59 		thresh = myMQ3.findThreshold(threshContext, 30, mybuffer, samplelen)
     60 		myMQ3.printGraph(threshContext, 5)
     61 		if(thresh):
     62 			print "Threshold is ", thresh
     63