1/*jslint node:true, vars:true, bitwise:true, unparam:true */ 2/*jshint unused:true */ 3/* 4* Author: Zion Orent <zorent@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 27var CO2_lib = require('jsupm_mhz16'); 28 29// Instantiate a MHZ16 serial CO2 sensor on uart 0. 30// This example was tested on the Grove CO2 sensor module. 31var myCO2_obj = new CO2_lib.MHZ16(0); 32 33// make sure port is initialized properly. 9600 baud is the default. 34if (!myCO2_obj.setupTty(CO2_lib.int_B9600)) 35{ 36 console.log("Failed to setup tty port parameters"); 37 process.exit(0); 38} 39 40outputStr = "Make sure that the sensor has had " + 41 "at least 3 minutes to warm up"; 42console.log(outputStr); 43outputStr = "or you will not get valid results."; 44console.log(outputStr); 45outputStr = "The temperature reported is not the ambient temperature,"; 46console.log(outputStr); 47outputStr = "but rather the temperature of the sensor elements."; 48console.log(outputStr); 49 50var gas = CO2_lib.new_intp(); 51var temp = CO2_lib.new_intp(); 52 53function writeCO2data() 54{ 55 myCO2_obj.getData(gas, temp); 56 outputStr = "CO2 concentration: " + CO2_lib.intp_value(gas) + 57 " PPM, " + 58 "Temperature (in C): " + CO2_lib.intp_value(temp); 59 console.log(outputStr); 60} 61var myInterval; 62setTimeout(function() 63{ 64 myInterval = setInterval(writeCO2data, 2000); 65}, 1000); 66 67 68// Print message, clear memory when exiting 69process.on('SIGINT', function() 70{ 71 clearInterval(myInterval); 72 myCO2_obj = null; 73 CO2_lib.cleanUp(); 74 CO2_lib = null; 75 console.log("Exiting"); 76 process.exit(0); 77}); 78