upm/examples/javascript/guvas12d.js

/*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 UVSensor = require('jsupm_guvas12d');

// Instantiate a UV sensor on analog pin A0
var myUVSensor = new UVSensor.GUVAS12D(0);

// analog voltage, usually 3.3 or 5.0
var g_GUVAS12D_AREF = 5.0;
var g_SAMPLES_PER_QUERY = 1024;

setInterval(function()
{
	var outputStr = "AREF: " + g_GUVAS12D_AREF 
					+ ", Voltage value (higher means more UV): "
					+ roundNum(myUVSensor.value(g_GUVAS12D_AREF, g_SAMPLES_PER_QUERY), 6);
	console.log(outputStr);
}, 1000);

function roundNum(num, decimalPlaces)
{
	var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
	return (Math.round((num + extraNum) * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
}

// Print message when exiting
process.on('SIGINT', function()
{
	console.log("Exiting...");
	process.exit(0);
});