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      1 /*
      2  * Author: Jon Trulson <jtrulson (at) 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 
     36 void sig_handler(int signo)
     37 {
     38   if (signo == SIGINT)
     39     shouldRun = false;
     40 }
     41 
     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