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hmc5883l: JavaScript example file for hmc5883l 3-axis compass

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Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>
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Zion Orent 2015-01-15 14:26:13 -08:00 committed by Sarah Knepper
parent f00de88f97
commit fb8dd8ad85
1 changed files with 61 additions and 0 deletions
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examples/javascript/hmc5883l.js Normal file
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/*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.
*/
// Load Compass module
var hmc5883l = require('jsupm_hmc5883l');
// load this on i2c
var myCompass = new hmc5883l.Hmc5883l(0);
// Set your declination from true north in radians
myCompass.set_declination(0.2749);
var coordsObj;
// Print out the coordinates, heading, and direction every second
setInterval(function()
{
myCompass.update(); // Update the coordinates
coordsObj = myCompass.coordinates();
var coords = (coordsObj.getitem(0) + " ");
coords += (coordsObj.getitem(1) + " ");
coords += coordsObj.getitem(2);
var heading = round2Digits(myCompass.heading());
var direction = round2Digits(myCompass.direction());
var compassResults = "coords: " + coords +
" heading: " + heading + " direction " + direction;
console.log(compassResults);
}, 1000);
function round2Digits(num)
{
return Math.round((num + 0.00001) * 100) / 100;
}
// Print message when exiting
process.on('SIGINT', function()
{
console.log("Exiting...");
process.exit(0);
});