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      1 # Author: Mihai Tudor Panu <mihai.tudor.panu (at] 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 
     23 from time import sleep
     24 import pyupm_gas as TP401
     25 
     26 # Give a qualitative meaning to the value from the sensor
     27 def 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
     35 airSensor = TP401.TP401(0)
     36 
     37 # Wait for sensor to warm up
     38 print "Sensor is warming up for 3 minutes..."
     39 for i in range (1, 4):
     40     sleep(60)
     41     print i, "minute(s) passed."
     42 print "Sensor is ready!"
     43 
     44 # Loop indefinitely
     45 while 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