1# Author: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
2# Copyright (c) 2014 Intel Corporation.
3#
4# Permission is hereby granted, free of charge, to any person obtaining
5# a copy of this software and associated documentation files (the
6# "Software"), to deal in the Software without restriction, including
7# without limitation the rights to use, copy, modify, merge, publish,
8# distribute, sublicense, and/or sell copies of the Software, and to
9# permit persons to whom the Software is furnished to do so, subject to
10# the following conditions:
11#
12# The above copyright notice and this permission notice shall be
13# included in all copies or substantial portions of the Software.
14#
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22
23from time import sleep
24import pyupm_gas as TP401
25
26# Give a qualitative meaning to the value from the sensor
27def airQuality(value):
28    if(value < 50): return "Fresh Air"
29    if(value < 200): return "Normal Indoor Air"
30    if(value < 400): return "Low Pollution"
31    if(value < 600): return "High Pollution - Action Recommended"
32    return "Very High Pollution - Take Action Immediately"
33
34# New Grove Air Quality Sensor on AIO pin 0
35airSensor = TP401.TP401(0)
36
37# Wait for sensor to warm up
38print "Sensor is warming up for 3 minutes..."
39for i in range (1, 4):
40    sleep(60)
41    print i, "minute(s) passed."
42print "Sensor is ready!"
43
44# Loop indefinitely
45while True:
46
47    # Read values (consecutive reads might vary slightly)
48    value = airSensor.getSample()
49    ppm = airSensor.getPPM()
50
51    print "raw: %4d" % value , " ppm: %5.2f   " % ppm , airQuality(value)
52
53    # Sleep for 2.5 s
54    sleep(2.5)
55