upm/examples/javascript/otp538u.js

/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */

/*
* Author: Zion Orent <zorent@ics.com>
* Copyright (c) 2015 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.
*/

// analog voltage, usually 3.3 or 5.0
var OTP538U_AREF = 5.0;

var tempIRSensor_lib = require('jsupm_otp538u');

// Instantiate a OTP538U on analog pins A0 and A1
// A0 is used for the Ambient Temperature and A1 is used for the
// Object temperature.
var tempIRSensor_obj = new tempIRSensor_lib.OTP538U(0, 1, OTP538U_AREF);


function checkTemp()
{
	var outputStr = "Ambient temp: " +
		roundNum(tempIRSensor_obj.ambientTemperature(), 2) +
		" C, Object temp: " +
		roundNum(tempIRSensor_obj.objectTemperature(), 2) +
		" C";
	console.log(outputStr);
}

var myInterval = setInterval(checkTemp, 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));
}

// When exiting: clear interval and print message
process.on('SIGINT', function()
{
	clearInterval(myInterval);
	console.log("Exiting...");
	process.exit(0);
});