buzzer: JavaScript example for Grove buzzer

Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>

examples/javascript/buzzer.js

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+/*jslint node:true, vars:true, bitwise:true, unparam:true */
+/*jshint unused:true */
+/*global */
+/*
+ * Author: Zion Orent <zorent@ics.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.
+ */
+
+var upmBuzzer = require("jsupm_buzzer");
+// Initialize on GPIO 5
+var myBuzzer = new upmBuzzer.Buzzer(5);
+var chords = [];
+chords.push(upmBuzzer.DO);
+chords.push(upmBuzzer.RE);
+chords.push(upmBuzzer.MI);
+chords.push(upmBuzzer.FA);
+chords.push(upmBuzzer.SOL);
+chords.push(upmBuzzer.LA);
+chords.push(upmBuzzer.SI);
+chords.push(upmBuzzer.DO);
+chords.push(upmBuzzer.SI);
+var chordIndex = 0;
+
+// Print sensor name
+console.log(myBuzzer.name());
+
+function melody()
+{
+    if (chords.length != 0)
+    {
+        //Play sound for one second
+        console.log( myBuzzer.playSound(chords[chordIndex], 1000000) );
+        chordIndex++;
+        //Reset the sound to start from the beginning. 
+        if (chordIndex > chords.length - 1)
+			chordIndex = 0;
+    }
+}
+setInterval(melody, 100);
+
+// Print message when exiting
+process.on('SIGINT', function()
+{
+	console.log("Exiting...");
+	process.exit(0);
+});