#!/usr/bin/python # Author: Jon Trulson # Copyright (c) 2015 Intel Corporation. # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. import time, sys, signal, atexit import pyupm_dfrph as sensorObj # Instantiate a DFRPH sensor on analog pin A0, with an analog # reference voltage of 5.0 sensor = sensorObj.DFRPH(0, 5.0) ## Exit handlers ## # This function stops python from printing a stacktrace when you hit control-C def SIGINTHandler(signum, frame): raise SystemExit # This function lets you run code on exit def exitHandler(): print "Exiting" sys.exit(0) # Register exit handlers atexit.register(exitHandler) signal.signal(signal.SIGINT, SIGINTHandler) # After calibration, set the offset (based on calibration with a pH # 7.0 buffer solution). See the UPM sensor documentation for # calibrations instructions. sensor.setOffset(0.065); # Every second, sample the pH and output it's corresponding # analog voltage. while (1): print "Detected volts: ", sensor.volts() print "pH value: ", sensor.pH() time.sleep(1)