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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 "mq6.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
     37 sig_handler(int signo)
     38 {
     39   if (signo == SIGINT)
     40     {
     41       shouldRun = false;
     42     }
     43 }
     44 
     45 //! [Interesting]
     46 int main(int argc, char **argv)
     47 {
     48   // Attach gas sensor to Analog A0
     49   upm::MQ6 *sensor = new upm::MQ6(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