Home | History | Annotate | Download | only in javascript 
      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 /*
      4 * Author: Zion Orent <zorent (at) ics.com>
      5 * Copyright (c) 2015 Intel Corporation.
      6 *
      7 * Permission is hereby granted, free of charge, to any person obtaining
      8 * a copy of this software and associated documentation files (the
      9 * "Software"), to deal in the Software without restriction, including
     10 * without limitation the rights to use, copy, modify, merge, publish,
     11 * distribute, sublicense, and/or sell copies of the Software, and to
     12 * permit persons to whom the Software is furnished to do so, subject to
     13 * the following conditions:
     14 *
     15 * The above copyright notice and this permission notice shall be
     16 * included in all copies or substantial portions of the Software.
     17 *
     18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25 */
     26 
     27 var upmMQ2 = require("jsupm_gas");
     28 
     29 // Attach gas sensor to AIO0
     30 var myMQ2 = new upmMQ2.MQ2(0);
     31 
     32 var threshContext = new upmMQ2.thresholdContext;
     33 threshContext.averageReading = 0;
     34 threshContext.runningAverage = 0;
     35 threshContext.averagedOver = 2;
     36 
     37 // Infinite loop, ends when script is cancelled
     38 // Repeatedly, take a sample every 2 milliseconds;
     39 // find the average of 128 samples; and
     40 // print a running graph of the averages using a resolution of 5
     41 while(1)
     42 {
     43     var buffer = new upmMQ2.uint16Array(128);
     44     var len = myMQ2.getSampledWindow(2, 128, buffer);
     45     if (len)
     46     {
     47         var thresh = myMQ2.findThreshold(threshContext, 30, buffer, len);
     48         myMQ2.printGraph(threshContext, 5);
     49         //if (thresh)
     50         //    console.log("Threshold is " + thresh);
     51     }
     52 }
     53 
     54 // Print message when exiting
     55 process.on('SIGINT', function()
     56 {
     57 	console.log("Exiting...");
     58 	process.exit(0);
     59 });
     60