svn.andrew.net.au/scripts/read-temperature.py

#!/usr/bin/python

###
# Program to read the temperature from a DLP-TEMP-G from a Linux computer
# http://www.dlpdesign.com/usb/temp.shtml
#
# Loosely based on Tim Jensen's program at
# http://www.jensens.org/tim/read-temperature.txt
#
# Copyright (c) 2007 Andrew Pollock <me@andrew.net.au>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

try:
  import serial
except ImportError:
  print "This program requires pyserial,", \
    "try checking the python-serial package is installed"

from optparse import OptionParser

SENSOR_QUERY_CMD = (None, 'S', 'T', 'U')
USAGE = "usage: %prog [options] [action]"

parser = OptionParser(USAGE)
parser.add_option("-F", "--fahrenheit", action="store_false", 
  dest="use_celsius", help="Output temperature in degrees Fahrenheit", 
  default=False)
parser.add_option("-C", "--celsius", action="store_true", 
  dest="use_celsius", help="Output temperature in degrees Celsius", 
  default=True)
parser.add_option("-d", "--device", action="store", type="string",
  dest="device", help="device to communicate with", 
  default="/dev/ttyUSB0")
parser.add_option("-s", "--sensor", action="store", type="int",
  dest="sensor", help="sensor to query",
  default="1")
parser.add_option("--mrtg", action="store_true",
  dest="output_mrtg", help="Output decimal value suitable for MRTG",
  default=False)
(options, args) = parser.parse_args()

if not(options.sensor > 0 and options.sensor <= len(SENSOR_QUERY_CMD) - 1):
  parser.error("Invalid sensor")

ser = serial.Serial(options.device, 9600, timeout=1)

ser.write(SENSOR_QUERY_CMD[options.sensor])
buf = ser.read(8)

temp = ord(buf[0]) | (ord(buf[1]) << 8)

degrees = temp / 16.0

if (options.use_celsius):
  if (options.output_mrtg):
    print "%.0f" % degrees
  else:
    print "%.4f degrees Celsius" % degrees
else:
  degrees = (9.0/5.0) * degrees + 32.0
  if (options.output_mrtg):
    print "%.0f" % degrees
  else:
    print "%.4f degrees Fahrenheit" % degrees
1	apollock	18	#!/usr/bin/python
2
3			###
4			# Program to read the temperature from a DLP-TEMP-G from a Linux computer
5			# http://www.dlpdesign.com/usb/temp.shtml
6			#
7			# Loosely based on Tim Jensen's program at
8			# http://www.jensens.org/tim/read-temperature.txt
9			#
10			# Copyright (c) 2007 Andrew Pollock <me@andrew.net.au>
11			#
12			# This program is free software; you can redistribute it and/or modify
13			# it under the terms of the GNU General Public License as published by
14			# the Free Software Foundation; either version 2 of the License.
15			#
16			# This program is distributed in the hope that it will be useful,
17			# but WITHOUT ANY WARRANTY; without even the implied warranty of
18			# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19			# GNU General Public License for more details.
20			#
21			# You should have received a copy of the GNU General Public License along
22			# with this program; if not, write to the Free Software Foundation, Inc.,
23			# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24			#
25
26			try:
27			import serial
28			except ImportError:
29			print "This program requires pyserial,", \
30			"try checking the python-serial package is installed"
31
32			from optparse import OptionParser
33
34			SENSOR_QUERY_CMD = (None, 'S', 'T', 'U')
35			USAGE = "usage: %prog [options] [action]"
36
37			parser = OptionParser(USAGE)
38			parser.add_option("-F", "--fahrenheit", action="store_false",
39			dest="use_celsius", help="Output temperature in degrees Fahrenheit",
40			default=False)
41			parser.add_option("-C", "--celsius", action="store_true",
42			dest="use_celsius", help="Output temperature in degrees Celsius",
43			default=True)
44			parser.add_option("-d", "--device", action="store", type="string",
45			dest="device", help="device to communicate with",
46			default="/dev/ttyUSB0")
47			parser.add_option("-s", "--sensor", action="store", type="int",
48			dest="sensor", help="sensor to query",
49			default="1")
50			parser.add_option("--mrtg", action="store_true",
51			dest="output_mrtg", help="Output decimal value suitable for MRTG",
52			default=False)
53			(options, args) = parser.parse_args()
54
55			if not(options.sensor > 0 and options.sensor <= len(SENSOR_QUERY_CMD) - 1):
56			parser.error("Invalid sensor")
57
58			ser = serial.Serial(options.device, 9600, timeout=1)
59
60			ser.write(SENSOR_QUERY_CMD[options.sensor])
61			buf = ser.read(8)
62
63			temp = ord(buf[0]) \| (ord(buf[1]) << 8)
64
65			degrees = temp / 16.0
66
67			if (options.use_celsius):
68			if (options.output_mrtg):
69			print "%.0f" % degrees
70			else:
71			print "%.4f degrees Celsius" % degrees
72			else:
73			degrees = (9.0/5.0) * degrees + 32.0
74			if (options.output_mrtg):
75			print "%.0f" % degrees
76			else:
77			print "%.4f degrees Fahrenheit" % degrees