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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 /*
      4 * Author: Zion Orent <zorent (at) ics.com>
      5 * Copyright (c) 2015 Intel Corporation.
      6 *
      7 * Permission is hereby granted, free of charge, to any person obtaining
      8 * a copy of this software and associated documentation files (the
      9 * "Software"), to deal in the Software without restriction, including
     10 * without limitation the rights to use, copy, modify, merge, publish,
     11 * distribute, sublicense, and/or sell copies of the Software, and to
     12 * permit persons to whom the Software is furnished to do so, subject to
     13 * the following conditions:
     14 *
     15 * The above copyright notice and this permission notice shall be
     16 * included in all copies or substantial portions of the Software.
     17 *
     18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25 */
     26 
     27 var collision_lib = require("jsupm_grovecollision");
     28 
     29 // The was tested with the Grove Collision Sensor
     30 // Instantiate a Grove Collision on digital pin D2
     31 var collision_obj = new collision_lib.GroveCollision(2);
     32 
     33 var collisionState = false;
     34 console.log("No collision");
     35 
     36 // Having an infinate loop prevents nodeJS from catching Cntl-C
     37 // We need to catch Cntl-C to clean up memory
     38 // Instead, we check the collision sensor every millisecond
     39 var myInterval = setInterval(function()
     40 {
     41 	if (collision_obj.isColliding() && !collisionState)
     42 	{
     43 		console.log("Collision!");
     44 		collisionState = true;
     45 	}
     46 	else if (!collision_obj.isColliding() && collisionState)
     47 	{
     48 		console.log("No collision");
     49 		collisionState = false;
     50 	}
     51 }, 1);
     52 
     53 // When exiting: clear interval, clean up memory, and print message
     54 process.on('SIGINT', function()
     55 {
     56 	clearInterval(myInterval);
     57 	collision_obj = null;
     58 	collision_lib.cleanUp();
     59 	collision_lib = null;
     60 	console.log("Exiting...");
     61 	process.exit(0);
     62 });
     63