/*
 * Author: Jun Kato <i@junkato.jp>
 * Copyright (c) 2015 Jun Kato.
 *
 * Thanks to Seeed Studio for a working arduino sketch
 *
 * 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 ultrasonic = require("jsupm_groveultrasonic");
var sensor = new ultrasonic.GroveUltraSonic(2);

var myInterval = setInterval(function()
{
  var travelTime = sensor.getDistance();
  if (travelTime > 0) {
    var distance = (travelTime / 29 / 2).toFixed(3);
    console.log("distance: " + distance + " [cm]");
  }
}, 200);

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