Merge branch 'jrvandr-2014-01-15-pr68' js servo example

examples/javascript/servo.js

@@ -0,0 +1,71 @@
+/*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.
+ */
+
+//Load servo module.
+var servoModule = require("jsupm_servo");
+
+//Instantiate Servo module on GPIO 5
+var servo = new servoModule.Servo(5);
+servo.setMinPulseWidth(600);
+servo.setMaxPulseWidth(2200);
+
+// function to initialize servo
+    // timeOffset: how long after hitting "run"
+    //		should we start this servo instance
+    // timeInterval: how frequently should this instance run after timeOffset
+    // angle: the angle for this instance
+function startServo(timeOffset, timeInterval, angle)
+{
+    // Start running this instance after timeOffset milliseconds
+    setTimeout(function()
+    {
+        console.log("Starting angle is " + angle);
+        // run this instance every timeInterval milliseconds
+        setInterval(function()
+        {
+            servo.setAngle(angle);
+        }, timeInterval);
+    }, timeOffset);
+    // timeOffset tells setTimeout when
+    //		to execute the function specified in the first param
+    // angle is passed as a param to the specified function
+}
+// start immediately, run every 3 seconds, go 0 degrees
+startServo(0, 3000, 0);
+
+// start in 1 second, run every 3 seconds, go 90 degrees
+startServo(1000, 3000, 90);
+
+// start in 2 seconds, run every 3 seconds, go 180 degrees
+startServo(2000, 3000, 180);
+
+// Print message when exiting
+process.on('SIGINT', function()
+{
+	console.log("Exiting...");
+	process.exit(0);
+});