upm/examples/python/t3311.py

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#!/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.
from __future__ import print_function
import time, sys, signal, atexit
from upm import pyupm_t3311 as sensorObj
def main():
## 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 /", end=' ')
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(), end=' ')
print("C /", sensor.getDewPointTemperature(True), "F")
print("Absolute Humidity:", sensor.getAbsoluteHumidity(), "g/m3")
print("Specific Humidity:", sensor.getSpecificHumidity(), end=' ')
print("g/kg")
print("Mixing Ratio:", sensor.getMixingRatio(), "g/kg")
print("Specific Enthalpy:", sensor.getSpecificEnthalpy(), end=' ')
print("kJ/kg")
print()
time.sleep(1)
if __name__ == '__main__':
main()