diff --git a/examples/python/mq303a.py b/examples/python/mq303a.py new file mode 100644 index 00000000..de71bcf5 --- /dev/null +++ b/examples/python/mq303a.py @@ -0,0 +1,75 @@ +#!/usr/bin/python +# Author: Zion Orent +# Copyright (c) 2015 Intel Corporation. +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +import time, sys, signal, atexit + +# Load alcohol sensor module +import pyupm_mq303a as upmMq303a + +# Instantiate an mq303a sensor on analog pin A0 +# This device uses a heater powered from an analog I/O pin. +# If using A0 as the data pin, then you need to use A1, as the heater +# pin (if using a grove mq303a). For A1, we can use the D15 gpio, +# setup as an output, and drive it low to power the heater. +myAlcoholSensor = upmMq303a.MQ303A(0, 15) + + +## Exit handlers ## +# This function stops python from printing a stacktrace when you hit control-C +def SIGINTHandler(signum, frame): + raise SystemExit + +# This function lets you run code on exit, including functions from myAlcoholSensor +def exitHandler(): + print "Exiting" + sys.exit(0) + +# Register exit handlers +atexit.register(exitHandler) +signal.signal(signal.SIGINT, SIGINTHandler) + + +print "Enabling heater and waiting 2 minutes for warmup." + +# give time updates every 30 seconds until 2 minutes have passed +# for the alcohol sensor to warm up +def warmup(iteration): + totalSeconds = (30 * iteration) + time.sleep(30) + print totalSeconds, "seconds have passed" +warmup(1) +warmup(2) +warmup(3) +warmup(4) + +notice = ("This sensor may need to warm " +"until the value drops below about 450.") +print notice + +# Print the detected alcohol value every second +while(1): + val = myAlcoholSensor.value() + msg = "Alcohol detected " + msg += "(higher means stronger alcohol): " + print msg + str(val) + time.sleep(1)