groveehr: python example and js modification for groveehr heart-rate sensor

Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/javascript/groveehr.js

@@ -1,6 +1,5 @@
 /*jslint node:true, vars:true, bitwise:true, unparam:true */
 /*jshint unused:true */
-/*global */
 /*
 * Author: Zion Orent <zorent@ics.com>
 * Copyright (c) 2014 Intel Corporation.
@@ -35,26 +34,31 @@ myHeartRateSensor.clearBeatCounter();
 myHeartRateSensor.initClock();
 myHeartRateSensor.startBeatCounter();
 
-setInterval(readHeartRate, 1000);
-
-function readHeartRate()
+var millis, beats, hr;
+var myInterval = setInterval(function()
 {
 	// we grab these just for display purposes in this example
-	var millis = myHeartRateSensor.getMillis();
-	var beats = myHeartRateSensor.beatCounter();
+	millis = myHeartRateSensor.getMillis();
+	beats = myHeartRateSensor.beatCounter();
 
 	// heartRate() requires that at least 5 seconds pass before
 	// returning anything other than 0
-	var hr = myHeartRateSensor.heartRate();
+	hr = myHeartRateSensor.heartRate();
 
 	// output milliseconds passed, beat count, and computed heart rate
 	console.log("Millis: " + millis + " Beats: " + beats +
 	            " Heart Rate: " + hr);
-}
+}, 1000);
 
 // Print message when exiting
 process.on('SIGINT', function()
 {
-	console.log("Exiting...");
+	clearInterval(myInterval);
+	myHeartRateSensor.stopBeatCounter();
+	myHeartRateSensor = null
+	heartRateSensor.cleanUp();
+	heartRateSensor = null;
+
+	console.log("Exiting");
 	process.exit(0);
 });

examples/python/groveehr.py

@@ -0,0 +1,68 @@
+#!/usr/bin/python
+# Author: Zion Orent <zorent@ics.com>
+# Copyright (c) 2015 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.
+
+
+import time, sys, signal, atexit
+import pyupm_groveehr as upmGroveehr
+
+# Instantiate a Grove Ear-clip Heart Rate sensor on digital pin D2
+myHeartRateSensor = upmGroveehr.GroveEHR(2)
+
+
+## Exit handlers ##
+# This stops python from printing a stacktrace when you hit control-C
+def SIGINTHandler(signum, frame):
+	raise SystemExit
+
+# This lets you run code on exit,
+# including functions from myHeartRateSensor
+def exitHandler():
+	myHeartRateSensor.stopBeatCounter()
+	print "Exiting"
+	sys.exit(0)
+
+# Register exit handlers
+atexit.register(exitHandler)
+signal.signal(signal.SIGINT, SIGINTHandler)
+
+
+# set the beat counter to 0, init the clock and start counting beats
+myHeartRateSensor.clearBeatCounter()
+myHeartRateSensor.initClock()
+myHeartRateSensor.startBeatCounter()
+
+while(1):
+	# we grab these (millis and flowCount) just for display
+	# purposes in this example
+	millis = myHeartRateSensor.getMillis()
+	beats = myHeartRateSensor.beatCounter()
+
+	# heartRate() requires that at least 5 seconds pass before
+	# returning anything other than 0
+	fr = myHeartRateSensor.heartRate()
+
+	# output milliseconds passed, beat count, and computed heart rate
+	outputStr = "Millis: {0} Beats: {1} Heart Rate: {2}".format(
+	millis, beats, fr)
+	print outputStr
+	time.sleep(1)