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 <signal.h>
28 #include "mg811.h"
29
30 using namespace std;
31
32 bool shouldRun = true;
33
34 #define MG811_AREF 5.0
35
sig_handler(int signo)36 void sig_handler(int signo)
37 {
38 if (signo == SIGINT)
39 shouldRun = false;
40 }
41
main()42 int main()
43 {
44 signal(SIGINT, sig_handler);
45
46 //! [Interesting]
47
48 // Instantiate an MG811 on analog pin A0, and digital pin D2 with an
49 // analog reference voltage of MG811_AREF (5.0)
50 upm::MG811 *sensor = new upm::MG811(0, 2, MG811_AREF);
51
52 // Every tenth of a second, sample the sensor and output it's
53 // detected CO2 concentration in parts per million (ppm)
54
55 while (shouldRun)
56 {
57 cout << "CO2 concentration in PPM: " << sensor->ppm() << endl;
58
59 usleep(100000);
60 }
61
62 //! [Interesting]
63
64 cout << "Exiting" << endl;
65
66 delete sensor;
67 return 0;
68 }
69