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      1 #!/usr/bin/python
      2 # Author: Zion Orent <zorent (at] 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 
     24 import time, sys, signal, atexit
     25 import pyupm_grovewfs as upmGrovewfs
     26 
     27 # Instantiate a Grove Water Flow Sensor on digital pin D2
     28 myWaterFlow = upmGrovewfs.GroveWFS(2)
     29 
     30 
     31 ## Exit handlers ##
     32 # This stops python from printing a stacktrace when you hit control-C
     33 def SIGINTHandler(signum, frame):
     34 	raise SystemExit
     35 
     36 # This function lets you run code on exit,
     37 # including functions from myWaterFlow
     38 def exitHandler():
     39 	myWaterFlow.stopFlowCounter()
     40 	print "Exiting"
     41 	sys.exit(0)
     42 
     43 # Register exit handlers
     44 atexit.register(exitHandler)
     45 signal.signal(signal.SIGINT, SIGINTHandler)
     46 
     47 
     48 # set the flow counter to 0 and start counting
     49 myWaterFlow.clearFlowCounter()
     50 myWaterFlow.startFlowCounter()
     51 
     52 while (1):
     53 	# we grab these (millis and flowCount) just for display
     54 	# purposes in this example
     55 	millis = myWaterFlow.getMillis()
     56 	flowCount = myWaterFlow.flowCounter()
     57 
     58 	fr = myWaterFlow.flowRate()
     59 
     60 	# output milliseconds passed, flow count, and computed flow rate
     61 	outputStr = "Millis: {0} Flow Count: {1} Flow Rate: {2} LPM".format(
     62 	millis, flowCount, fr)
     63 	print outputStr
     64 	time.sleep(2)
     65