1765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang#!/usr/bin/python 2765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Author: Jon Trulson <jtrulson@ics.com> 3765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Copyright (c) 2015 Intel Corporation. 4765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# 5765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Permission is hereby granted, free of charge, to any person obtaining 6765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# a copy of this software and associated documentation files (the 7765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# "Software"), to deal in the Software without restriction, including 8765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# without limitation the rights to use, copy, modify, merge, publish, 9765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# distribute, sublicense, and/or sell copies of the Software, and to 10765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# permit persons to whom the Software is furnished to do so, subject to 11765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# the following conditions: 12765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# 13765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# The above copyright notice and this permission notice shall be 14765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# included in all copies or substantial portions of the Software. 15765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# 16765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 24765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangimport time, sys, signal, atexit 25765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangimport pyupm_mg811 as sensorObj 26765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 27765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Instantiate an MG811 on analog pin A0, and digital pin D2 with an 28765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# analog reference voltage of MG811_AREF (5.0) 29765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 30765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangsensor = sensorObj.MG811(0, 2, 5.0) 31765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 32765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang## Exit handlers ## 33765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# This function stops python from printing a stacktrace when you hit control-C 34765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangdef SIGINTHandler(signum, frame): 35765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang raise SystemExit 36765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 37765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# This function lets you run code on exit 38765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangdef exitHandler(): 39765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang print "Exiting" 40765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang sys.exit(0) 41765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 42765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Register exit handlers 43765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangatexit.register(exitHandler) 44765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangsignal.signal(signal.SIGINT, SIGINTHandler) 45765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 46765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# Every tenth of a second, sample the sensor and output it's 47765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang# detected CO2 concentration in parts per million (ppm) 48765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang 49765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhangwhile (1): 50765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang print "CO2 concentration in PPM: ", sensor.ppm() 51765adb95dc941c32690d6c43bc08b9d07d197fcbJianxun Zhang time.sleep(.1) 52