tp401: grove air quality sensor and examples

Signed-off-by: Mihai Tudor Panu <mihai.t.panu@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/python/tp401.py

@@ -0,0 +1,54 @@
+# Author: Mihai Tudor Panu <mihai.t.panu@intel.com>
+# Copyright (c) 2014 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.
+
+from time import sleep
+import pyupm_gas as TP401
+
+# Give a qualitative meaning to the value from the sensor
+def airQuality(value):
+    if(value < 50): return "Fresh Air"
+    if(value < 200): return "Normal Indoor Air"
+    if(value < 400): return "Low Pollution"
+    if(value < 600): return "High Pollution - Action Recommended"
+    return "Very High Pollution - Take Action Immediately"
+
+# New Grove Air Quality Sensor on AIO pin 0
+airSensor = TP401.TP401(0)
+
+# Wait for sensor to warm up
+print "Sensor is warming up for 3 minutes..."
+for i in range (1, 4):
+    sleep(60)
+    print i, "minute(s) passed."
+print "Sensor is ready!"
+
+# Loop indefinitely
+while True:
+
+    # Read values (consecutive reads might vary slightly)
+    value = airSensor.getSample()
+    ppm = airSensor.getPPM()
+
+    print "raw: %4d" % value , " ppm: %5.2f   " % ppm , airQuality(value)
+
+    # Sleep for 2.5 s
+    sleep(2.5)