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      1 /*
      2  * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.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 "mq3.h"
     28 #include <signal.h>
     29 #include <stdlib.h>
     30 #include <sys/time.h>
     31 
     32 int is_running = 0;
     33 uint16_t buffer [128];
     34 upm::MQ3 *sensor = NULL;
     35 
     36 void
     37 sig_handler(int signo)
     38 {
     39     printf("got signal\n");
     40     if (signo == SIGINT) {
     41         is_running = 1;
     42     }
     43 }
     44 
     45 //! [Interesting]
     46 int
     47 main(int argc, char **argv)
     48 {
     49     // Attach gas sensor to A0
     50     sensor = new upm::MQ3(0);
     51     signal(SIGINT, sig_handler);
     52 
     53     thresholdContext ctx;
     54     ctx.averageReading = 0;
     55     ctx.runningAverage = 0;
     56     ctx.averagedOver   = 2;
     57 
     58     // Infinite loop, ends when script is cancelled
     59     // Repeatedly, take a sample every 2 milliseconds;
     60     // find the average of 128 samples; and
     61     // print a running graph of the averages using a resolution of 5
     62     while (!is_running) {
     63         int len = sensor->getSampledWindow (2, 128, buffer);
     64         if (len) {
     65             int thresh = sensor->findThreshold (&ctx, 30, buffer, len);
     66             sensor->printGraph(&ctx, 5);
     67             if (thresh) {
     68                 // do something ....
     69             }
     70         }
     71     }
     72 
     73     std::cout << "exiting application" << std::endl;
     74 
     75     delete sensor;
     76 
     77     return 0;
     78 }
     79 //! [Interesting]
     80