1 /*
2 * Author: Jon Trulson <jtrulson@ics.com>
3 * Copyright (c) 2014 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 "mq303a.h"
29
30 using namespace std;
31
32 int shouldRun = true;
33
sig_handler(int signo)34 void sig_handler(int signo)
35 {
36 if (signo == SIGINT)
37 shouldRun = false;
38 }
39
main()40 int main ()
41 {
42 signal(SIGINT, sig_handler);
43
44 //! [Interesting]
45 // Instantiate an mq303a sensor on analog pin A0
46
47 // This device uses a heater powered from an analog I/O pin.
48 // If using A0 as the data pin, then you need to use A1, as the heater
49 // pin (if using a grove mq303a). For A1, we can use the D15 gpio,
50 // setup as an output, and drive it low to power the heater.
51
52 upm::MQ303A *mq303a = new upm::MQ303A(0, 15);
53
54 cout << "Enabling heater and waiting 2 minutes for warmup." << endl;
55 mq303a->heaterEnable(true);
56 sleep(120);
57
58 cout << "This sensor may need to warm until the value drops below about 450."
59 << endl;
60
61 // Print the detected alcohol value every second
62 while (shouldRun)
63 {
64 int val = mq303a->value();
65
66 cout << "Alcohol detected (higher means stronger alcohol): "
67 << val << endl;
68
69 sleep(1);
70 }
71 //! [Interesting]
72
73 cout << "Exiting" << endl;
74 mq303a->heaterEnable(false);
75
76 delete mq303a;
77 return 0;
78 }
79