upm/examples/python/t3311.py

#!/usr/bin/python
# Author: Jon Trulson <jtrulson@ics.com>
# Copyright (c) 2016 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_t3311 as sensorObj

## 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)

defaultDev = "/dev/ttyUSB0"

# if an argument was specified, use it as the device instead
if (len(sys.argv) > 1):
        defaultDev = sys.argv[1]

print "Initializing..."

# Instantiate an T3311 instance, using MODBUS slave address 1, and
# default comm parameters (9600, 8, N, 2)
sensor = sensorObj.T3311(defaultDev, 1)

# output the serial number and firmware revision
print "Serial Number:", sensor.getSerialNumber()
print "Firmware Revision: {0}.{1}".format(sensor.getFirmwareMajor(),
                                          sensor.getFirmwareMinor())
print

# update and print available values every second
while (1):
        # update our values from the sensor
        sensor.update()

        # we show both C and F for temperature
        print "Temperature:", sensor.getTemperature(), "C /",
        print sensor.getTemperature(True), "F"

        print "Humidity:", sensor.getHumidity(), "%"

        # this value depends on the sensor configuration -- by default
        # it is the dew point temperature
        print "Computed Value:", sensor.getComputedValue()

        # with FW revisions > 2.44, extended computed data is available
        if (sensor.extendedDataAvailable()):
                print "Dew Point Temperature:", sensor.getDewPointTemperature(),
                print "C /", sensor.getDewPointTemperature(True), "F"

                print "Absolute Humidity:", sensor.getAbsoluteHumidity(), "g/m3"

                print "Specific Humidity:", sensor.getSpecificHumidity(),
                print "g/kg"

                print "Mixing Ratio:", sensor.getMixingRatio(), "g/kg"

                print "Specific Enthalpy:", sensor.getSpecificEnthalpy(),
                print "kJ/kg"

        print
	time.sleep(1)