1/*
2 * Author: Jon Trulson <jtrulson@ics.com>
3 * Copyright (c) 2015 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25#include <unistd.h>
26#include <iostream>
27#include "mq4.h"
28#include <signal.h>
29#include <stdlib.h>
30#include <sys/time.h>
31
32bool shouldRun = true;
33
34using namespace std;
35
36void
37sig_handler(int signo)
38{
39  if (signo == SIGINT)
40    {
41      shouldRun = false;
42    }
43}
44
45//! [Interesting]
46int main(int argc, char **argv)
47{
48  // Attach gas sensor to Analog A0
49  upm::MQ4 *sensor = new upm::MQ4(0);
50  signal(SIGINT, sig_handler);
51
52  uint16_t buffer [128];
53
54  thresholdContext ctx;
55  ctx.averageReading = 0;
56  ctx.runningAverage = 0;
57  ctx.averagedOver   = 2;
58
59  // Infinite loop, ends when script is cancelled
60  // Repeatedly, take a sample every 2 microseconds;
61  // find the average of 128 samples; and
62  // print a running graph of asteriskss as averages
63  while (shouldRun)
64    {
65      int len = sensor->getSampledWindow (2, 128, buffer);
66      if (len) {
67        int thresh = sensor->findThreshold (&ctx, 30, buffer, len);
68        sensor->printGraph(&ctx, 5);
69        if (thresh) {
70          // do something ....
71        }
72      }
73    }
74
75  cout << "Exiting" << endl;
76
77  delete sensor;
78
79  return 0;
80}
81//! [Interesting]
82