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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 /*global */
      4 /*
      5 * Author: Zion Orent <zorent (at) ics.com>
      6 * Copyright (c) 2015 Intel Corporation.
      7 *
      8 * Permission is hereby granted, free of charge, to any person obtaining
      9 * a copy of this software and associated documentation files (the
     10 * "Software"), to deal in the Software without restriction, including
     11 * without limitation the rights to use, copy, modify, merge, publish,
     12 * distribute, sublicense, and/or sell copies of the Software, and to
     13 * permit persons to whom the Software is furnished to do so, subject to
     14 * the following conditions:
     15 *
     16 * The above copyright notice and this permission notice shall be
     17 * included in all copies or substantial portions of the Software.
     18 *
     19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     26 */
     27 
     28 var upmMQ3 = require("jsupm_gas");
     29 
     30 // Attach gas sensor to AIO0
     31 var myMQ3 = new upmMQ3.MQ3(0);
     32 
     33 var threshContext = new upmMQ3.thresholdContext;
     34 threshContext.averageReading = 0;
     35 threshContext.runningAverage = 0;
     36 threshContext.averagedOver = 2;
     37 
     38 // Infinite loop, ends when script is cancelled
     39 // Repeatedly, take a sample every 2 milliseconds;
     40 // find the average of 128 samples; and
     41 // print a running graph of the averages using a resolution of 5
     42 while(1)
     43 {
     44     var buffer = new upmMQ3.uint16Array(128);
     45     var len = myMQ3.getSampledWindow(2, 128, buffer);
     46     if (len)
     47     {
     48         var thresh = myMQ3.findThreshold(threshContext, 30, buffer, len);
     49         myMQ3.printGraph(threshContext, 5);
     50         //if (thresh)
     51         //    console.log("Threshold is " + thresh);
     52     }
     53 }
     54 
     55 // Print message when exiting
     56 process.on('SIGINT', function()
     57 {
     58 	console.log("Exiting...");
     59 	process.exit(0);
     60 });
     61