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76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
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#!/usr/bin/python
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# Author: Zion Orent <zorent@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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# Load alcohol sensor module
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import pyupm_mq303a as upmMq303a
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# Instantiate an mq303a sensor on analog pin A0
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# This device uses a heater powered from an analog I/O pin.
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# If using A0 as the data pin, then you need to use A1, as the heater
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# pin (if using a grove mq303a). For A1, we can use the D15 gpio,
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# setup as an output, and drive it low to power the heater.
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myAlcoholSensor = upmMq303a.MQ303A(0, 15)
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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 myAlcoholSensor
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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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print "Enabling heater and waiting 2 minutes for warmup."
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# give time updates every 30 seconds until 2 minutes have passed
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# for the alcohol sensor to warm up
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def warmup(iteration):
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totalSeconds = (30 * iteration)
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time.sleep(30)
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print totalSeconds, "seconds have passed"
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warmup(1)
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warmup(2)
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warmup(3)
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warmup(4)
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notice = ("This sensor may need to warm "
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"until the value drops below about 450.")
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print notice
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# Print the detected alcohol value every second
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while(1):
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val = myAlcoholSensor.value()
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msg = "Alcohol detected "
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msg += "(higher means stronger alcohol): "
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print msg + str(val)
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time.sleep(1)
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