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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) 2014 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 // JavaScript file for GP2Y0A family of IR Proximity Sensors
     27 
     28 // analog voltage, usually 3.3 or 5.0
     29 var GP2Y0A_AREF = 5.0;
     30 var SAMPLES_PER_QUERY = 20;
     31 
     32 var IRProximity = require('jsupm_gp2y0a');
     33 
     34 // Note, for the Grove 80cm version of this sensor, due to the way it is wired,
     35 // you need to plug this into the A0 port, where it will use the available
     36 // A1 pin for data.
     37 // Instantiate a GP2Y0A on analog pin A1
     38 var myVolts = new IRProximity.GP2Y0A(1);
     39 
     40 // The higher the voltage (closer to AREF) the closer the object is.
     41 // NOTE: The measured voltage will probably not exceed 3.3 volts.
     42 // Every second, print the averaged voltage value
     43 // (averaged over 20 samples).
     44 var myInterval = setInterval(function()
     45 {
     46 	console.log("AREF: " + GP2Y0A_AREF +
     47                 ", Voltage value (higher means closer): " +
     48                 myVolts.value(GP2Y0A_AREF, SAMPLES_PER_QUERY));
     49 }, 1000);
     50 
     51 // Print message when exiting
     52 process.on('SIGINT', function()
     53 {
     54 	clearInterval(myInterval);
     55 	myVolts = null;
     56 	IRProximity.cleanUp();
     57 	IRProximity = null;
     58 	console.log("Exiting...");
     59 	process.exit(0);
     60 });
     61