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_grovewfs as upmGrovewfs
26
27# Instantiate a Grove Water Flow Sensor on digital pin D2
28myWaterFlow = upmGrovewfs.GroveWFS(2)
29
30
31## Exit handlers ##
32# This stops python from printing a stacktrace when you hit control-C
33def SIGINTHandler(signum, frame):
34	raise SystemExit
35
36# This function lets you run code on exit,
37# including functions from myWaterFlow
38def exitHandler():
39	myWaterFlow.stopFlowCounter()
40	print "Exiting"
41	sys.exit(0)
42
43# Register exit handlers
44atexit.register(exitHandler)
45signal.signal(signal.SIGINT, SIGINTHandler)
46
47
48# set the flow counter to 0 and start counting
49myWaterFlow.clearFlowCounter()
50myWaterFlow.startFlowCounter()
51
52while (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