1#!/usr/bin/python
2# Author: Zion Orent <zorent@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
24import time, sys, signal, atexit
25import pyupm_mhz16 as upmMhz16
26
27# Instantiate a MHZ16 serial CO2 sensor on uart 0.
28# This example was tested on the Grove CO2 sensor module.
29myCO2 = upmMhz16.MHZ16(0)
30
31
32## Exit handlers ##
33# This stops python from printing a stacktrace when you hit control-C
34def SIGINTHandler(signum, frame):
35	raise SystemExit
36
37# This function lets you run code on exit,
38# including functions from myCO2
39def exitHandler():
40	print "Exiting"
41	sys.exit(0)
42
43# Register exit handlers
44atexit.register(exitHandler)
45signal.signal(signal.SIGINT, SIGINTHandler)
46
47
48# make sure port is initialized properly.  9600 baud is the default.
49if (not myCO2.setupTty(upmMhz16.cvar.int_B9600)):
50	print "Failed to setup tty port parameters"
51	sys.exit(0)
52
53print ("Make sure that the sensor has had "
54"at least 3 minutes to warm up\n"
55"or you will not get valid results.\n"
56"The temperature reported is not the ambient temperature,\n"
57"but rather the temperature of the sensor elements.")
58
59gas = upmMhz16.new_intp()
60temp = upmMhz16.new_intp()
61
62time.sleep(1)
63
64while(1):
65	myCO2.getData(gas, temp)
66	outputStr = ("CO2 concentration: {0} PPM, "
67	"Temperature (in C): {1}".format(
68	upmMhz16.intp_value(gas), upmMhz16.intp_value(temp)))
69	print outputStr
70
71	time.sleep(2)
72