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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>
62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
#!/usr/bin/python
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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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import time, sys, signal, atexit
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import pyupm_cwlsxxa as sensorObj
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## Exit handlers ##
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# This function stops python from printing a stacktrace when you hit control-C
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def SIGINTHandler(signum, frame):
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raise SystemExit
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# This function lets you run code on exit
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def exitHandler():
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print "Exiting"
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sys.exit(0)
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# Register exit handlers
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atexit.register(exitHandler)
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signal.signal(signal.SIGINT, SIGINTHandler)
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print "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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sensor = sensorObj.CWLSXXA(0, 1, 2)
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# update and print available values every second
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while (1):
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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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print "Temperature:", sensor.getTemperature(), "C /",
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print sensor.getTemperature(True), "F"
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print "Humidity:", sensor.getHumidity(), "%"
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print "CO2:", sensor.getCO2(), "ppm"
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print
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time.sleep(1)
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