1/*jslint node:true, vars:true, bitwise:true, unparam:true */
2/*jshint unused:true */
3/*
4 * Author: Jon Trulson <jtrulson@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 upmGAS = require("jsupm_gas");
28
29// Attach gas sensor to Analog A0
30var sensor = new upmGAS.MQ7(0);
31
32var threshContext = new upmGAS.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 microseconds;
39// find the average of 128 samples; and
40// print a running graph of asteriskss as averages
41
42while(1)
43{
44    var buffer = new upmGAS.uint16Array(128);
45    var len = sensor.getSampledWindow(2, 128, buffer);
46    if (len)
47    {
48        var thresh = sensor.findThreshold(threshContext, 30, buffer, len);
49        sensor.printGraph(threshContext, 5);
50        //if (thresh)
51        //    console.log("Threshold is " + thresh);
52    }
53}
54
55// Print message when exiting
56process.on('SIGINT', function()
57{
58	console.log("Exiting...");
59	process.exit(0);
60});
61