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The driver was developed using the Veris CWLSHTA CO2 Gas sensor. The 'T' variant supports a temperature sensor, and the 'H' variant supports a humidity sensor. All 3 signals are provided by the device as analog 0-5Vdc, 0-10Vdc, or 4-20ma loop current outputs. For devices supporting temperature, the valid temperature range is 10C to 50C. The humidity ranges from 0% to 100% (non-condensing). The CO2 sensor ranges from 0 to 2000 ppm. This driver was developed using the 5Vdc outputs and the 4-20ma outputs. For voltage outputs, your MCU must be configured for 5V operation. In addition, you must configure the sensor (via it's configuration switches) to output 0-5VDC only. Using any other analog reference voltage will require the appropriate external circuitry (such as a voltage divider) in order to interface safely with your MCU. In addition, the sensor can be configured for 4-20ma usage, by specifying the correct receiver resistance (in ohms) in the constructor. This sensor was tested with a Cooking Hacks (Libelium) 4-channel 4-20ma Arduino interface shield. For this interface, the receiver resistance was specified as 165.0 ohms. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>
67 lines
2.1 KiB
JavaScript
67 lines
2.1 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) 2016 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_cwlsxxa');
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/************** Main code **************/
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console.log("Initializing...");
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// Instantiate an CWLSXXA instance, using A0 for CO2, A1 for
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// humidity and A2 for temperature
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var sensor = new sensorObj.CWLSXXA(0, 1, 2);
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// update and print available values every second
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setInterval(function()
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{
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// update our values from the sensor
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sensor.update();
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// we show both C and F for temperature
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console.log("Temperature:", sensor.getTemperature(),
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"C /", sensor.getTemperature(true), "F");
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console.log("Humidity:", sensor.getHumidity(), "%");
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console.log("CO2:", sensor.getCO2(), "ppm");
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console.log("");
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}, 1000);
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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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