upm/examples/python/hwxpxx.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_hwxpxx 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("Using device", defaultDev)
print("Initializing...")
# Instantiate an HWXPXX instance, using MODBUS slave address 3, and
# default comm parameters (19200, 8, N, 2)
sensor = sensorObj.HWXPXX(defaultDev, 3)
# output the serial number and firmware revision
print("Slave ID:", sensor.getSlaveID())
# stored temperature and humidity offsets
print("Temperature Offset:", sensor.getTemperatureOffset())
print("Humidity Offset:", sensor.getHumidityOffset())
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(), "%")
print("Slider:", sensor.getSlider(), "%")
print("Override Switch Status:", sensor.getOverrideSwitchStatus())
print()
time.sleep(1)
if __name__ == '__main__':
main()