1/*jslint node:true, vars:true, bitwise:true, unparam:true */
2/*jshint unused:true */
3/*
4* Author: Zion Orent <zorent@ics.com>
5* Copyright (c) 2015 Intel Corporation.
6*
7* Permission is hereby granted, free of charge, to any person obtaining
8* a copy of this software and associated documentation files (the
9* "Software"), to deal in the Software without restriction, including
10* without limitation the rights to use, copy, modify, merge, publish,
11* distribute, sublicense, and/or sell copies of the Software, and to
12* permit persons to whom the Software is furnished to do so, subject to
13* the following conditions:
14*
15* The above copyright notice and this permission notice shall be
16* included in all copies or substantial portions of the Software.
17*
18* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25*/
26
27var upmMQ2 = require("jsupm_gas");
28
29// Attach gas sensor to AIO0
30var myMQ2 = new upmMQ2.MQ2(0);
31
32var threshContext = new upmMQ2.thresholdContext;
33threshContext.averageReading = 0;
34threshContext.runningAverage = 0;
35threshContext.averagedOver = 2;
36
37// Infinite loop, ends when script is cancelled
38// Repeatedly, take a sample every 2 milliseconds;
39// find the average of 128 samples; and
40// print a running graph of the averages using a resolution of 5
41while(1)
42{
43    var buffer = new upmMQ2.uint16Array(128);
44    var len = myMQ2.getSampledWindow(2, 128, buffer);
45    if (len)
46    {
47        var thresh = myMQ2.findThreshold(threshContext, 30, buffer, len);
48        myMQ2.printGraph(threshContext, 5);
49        //if (thresh)
50        //    console.log("Threshold is " + thresh);
51    }
52}
53
54// Print message when exiting
55process.on('SIGINT', function()
56{
57	console.log("Exiting...");
58	process.exit(0);
59});
60