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63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
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#!/usr/bin/python
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# Author: Jon Trulson <jtrulson@ics.com>
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# Copyright (c) 2015 Intel Corporation.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import time, sys, signal, atexit
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import pyupm_gas as upmGAS
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# Attach gas sensor to Analog A0
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sensor = upmGAS.MQ8(0)
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## Exit handlers ##
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# This function stops python from printing a stacktrace when you hit control-C
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def SIGINTHandler(signum, frame):
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raise SystemExit
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# This function lets you run code on exit, including functions from sensor
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def exitHandler():
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print "Exiting"
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sys.exit(0)
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# Register exit handlers
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atexit.register(exitHandler)
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signal.signal(signal.SIGINT, SIGINTHandler)
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threshContext = upmGAS.thresholdContext()
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threshContext.averageReading = 0
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threshContext.runningAverage = 0
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threshContext.averagedOver = 2
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# Infinite loop, ends when script is cancelled
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# Repeatedly, take a sample every 2 microseconds;
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# find the average of 128 samples; and
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# print a running graph of asteriskss as averages
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mybuffer = upmGAS.uint16Array(128)
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while(1):
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samplelen = sensor.getSampledWindow(2, 128, mybuffer)
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if samplelen:
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thresh = sensor.findThreshold(threshContext, 30, mybuffer, samplelen)
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sensor.printGraph(threshContext, 5)
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# if(thresh):
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# print "Threshold is ", thresh
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