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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>
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/*
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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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#include <unistd.h>
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#include <iostream>
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#include <signal.h>
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#include "cwlsxxa.h"
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using namespace std;
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bool shouldRun = true;
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void sig_handler(int signo)
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{
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if (signo == SIGINT)
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shouldRun = false;
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}
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int main(int argc, char **argv)
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{
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signal(SIGINT, sig_handler);
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//! [Interesting]
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cout << "Initializing..." << endl;
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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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upm::CWLSXXA *sensor = new upm::CWLSXXA(0, 1, 2);
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// update and print available values every second
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while (shouldRun)
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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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cout << "Temperature: " << sensor->getTemperature()
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<< " C / " << sensor->getTemperature(true) << " F"
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<< endl;
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cout << "Humidity: " << sensor->getHumidity()
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<< " %" << endl;
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cout << "CO2: " << sensor->getCO2()
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<< " ppm" << endl;
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cout << endl;
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sleep(1);
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}
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cout << "Exiting..." << endl;
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delete sensor;
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//! [Interesting]
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return 0;
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}
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