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This driver was developed on a DFRobot CO2 sensor based on the MG811: http://www.dfrobot.com/index.php?route=product/product&product_id=1023 It seems to *require* very precise calibration at 400ppm and 1000ppm to be accurate. It also gets pretty hot (due to the heater) and consumes significant current. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: sisinty sasmita patra <sisinty.s.patra@intel.com>
54 lines
1.8 KiB
JavaScript
54 lines
1.8 KiB
JavaScript
/*jslint node:true, vars:true, bitwise:true, unparam:true */
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/*jshint unused:true */
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/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2015 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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var sensorObj = require('jsupm_mg811');
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// Instantiate an MG811 on analog pin A0, and digital pin D2 with an
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// analog reference voltage of MG811_AREF (5.0)
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var sensor = new sensorObj.MG811(0, 2, 5.0);
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// Every tenth of a second, sample the sensor and output it's
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// detected CO2 concentration in parts per million (ppm)
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setInterval(function()
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{
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console.log("CO2 concentration in PPM: " + sensor.ppm());
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}, 100);
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// exit on ^C
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process.on('SIGINT', function()
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{
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sensor = null;
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sensorObj.cleanUp();
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sensorObj = null;
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console.log("Exiting.");
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process.exit(0);
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});
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