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This module implements support for the DFRobot Analog ORP (Oxidation/Reduction Potential) Meter. It requires 5.0 volts, but the more accurate the voltage specified (to the constructor), the more accurate the meter (paraphrased from the wiki). Signed-off-by: Jon Trulson <jtrulson@ics.com>
69 lines
2.4 KiB
Python
69 lines
2.4 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_dfrorp as sensorObj
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# Instantiate a DFRobot ORP sensor on analog pin A0 with an analog
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# reference voltage of 5.0.
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sensor = sensorObj.DFRORP(0, 5.0)
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# To calibrate:
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#
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# Disconnect the sensor probe (but leave the sensor interface board
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# connected). Then run one of the examples while holding down the
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# 'calibrate' button on the device. Read the ORP value reported
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# (it should be fairly small).
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#
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# This value is what you should supply to setCalibrationOffset().
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# Then reconnect the probe to the interface board and you should be
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# ready to go.
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#
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# DO NOT press the calibrate button on the interface board while
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# the probe is attached or you can permanently damage the probe.
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sensor.setCalibrationOffset(0.97);
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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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# Every second, update and print values
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while (True):
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sensor.update()
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print "ORP:", sensor.getORP(), "mV"
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print
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time.sleep(1)
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