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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 /*global */
      4 /*
      5 * Author: Zion Orent <zorent (at) ics.com>
      6 * Copyright (c) 2014 Intel Corporation.
      7 *
      8 * Permission is hereby granted, free of charge, to any person obtaining
      9 * a copy of this software and associated documentation files (the
     10 * "Software"), to deal in the Software without restriction, including
     11 * without limitation the rights to use, copy, modify, merge, publish,
     12 * distribute, sublicense, and/or sell copies of the Software, and to
     13 * permit persons to whom the Software is furnished to do so, subject to
     14 * the following conditions:
     15 *
     16 * The above copyright notice and this permission notice shall be
     17 * included in all copies or substantial portions of the Software.
     18 *
     19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     26 */
     27 
     28 var UVSensor = require('jsupm_guvas12d');
     29 
     30 // Instantiate a UV sensor on analog pin A0
     31 var myUVSensor = new UVSensor.GUVAS12D(0);
     32 
     33 // analog voltage, usually 3.3 or 5.0
     34 var g_GUVAS12D_AREF = 5.0;
     35 var g_SAMPLES_PER_QUERY = 1024;
     36 
     37 setInterval(function()
     38 {
     39 	var outputStr = "AREF: " + g_GUVAS12D_AREF
     40 					+ ", Voltage value (higher means more UV): "
     41 					+ roundNum(myUVSensor.value(g_GUVAS12D_AREF, g_SAMPLES_PER_QUERY), 6);
     42 	console.log(outputStr);
     43 }, 1000);
     44 
     45 function roundNum(num, decimalPlaces)
     46 {
     47 	var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
     48 	return (Math.round((num + extraNum) * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
     49 }
     50 
     51 // Print message when exiting
     52 process.on('SIGINT', function()
     53 {
     54 	console.log("Exiting...");
     55 	process.exit(0);
     56 });
     57