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
32 bool shouldRun = true;
33
34 using namespace std;
35
36 void
sig_handler(int signo)37 sig_handler(int signo)
38 {
39 if (signo == SIGINT)
40 {
41 shouldRun = false;
42 }
43 }
44
45 //! [Interesting]
main(int argc,char ** argv)46 int 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