1 /*jslint node:true, vars:true, bitwise:true, unparam:true */ 2 /*jshint unused:true */ 3 4 /* 5 * Author: Jon Trulson <jtrulson (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 29 var sensorObj = require('jsupm_mg811'); 30 31 // Instantiate an MG811 on analog pin A0, and digital pin D2 with an 32 // analog reference voltage of MG811_AREF (5.0) 33 34 var sensor = new sensorObj.MG811(0, 2, 5.0); 35 36 // Every tenth of a second, sample the sensor and output it's 37 // detected CO2 concentration in parts per million (ppm) 38 39 setInterval(function() 40 { 41 console.log("CO2 concentration in PPM: " + sensor.ppm()); 42 }, 100); 43 44 // exit on ^C 45 process.on('SIGINT', function() 46 { 47 sensor = null; 48 sensorObj.cleanUp(); 49 sensorObj = null; 50 console.log("Exiting."); 51 process.exit(0); 52 }); 53 54
