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
import sys

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")

try:
  ser = serial.Serial(options.device, 9600, timeout=1)
except serial.SerialException, e:
  print "%s" % (e)
  sys.exit(1)

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

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	#!/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	import sys
34
35	SENSOR_QUERY_CMD = (None, 'S', 'T', 'U')
36	USAGE = "usage: %prog [options] [action]"
37
38	parser = OptionParser(USAGE)
39	parser.add_option("-F", "--fahrenheit", action="store_false",
40	dest="use_celsius", help="Output temperature in degrees Fahrenheit",
41	default=False)
42	parser.add_option("-C", "--celsius", action="store_true",
43	dest="use_celsius", help="Output temperature in degrees Celsius",
44	default=True)
45	parser.add_option("-d", "--device", action="store", type="string",
46	dest="device", help="device to communicate with",
47	default="/dev/ttyUSB0")
48	parser.add_option("-s", "--sensor", action="store", type="int",
49	dest="sensor", help="sensor to query",
50	default="1")
51	parser.add_option("--mrtg", action="store_true",
52	dest="output_mrtg", help="Output decimal value suitable for MRTG",
53	default=False)
54	(options, args) = parser.parse_args()
55
56	if not(options.sensor > 0 and options.sensor <= len(SENSOR_QUERY_CMD) - 1):
57	parser.error("Invalid sensor")
58
59	try:
60	ser = serial.Serial(options.device, 9600, timeout=1)
61	except serial.SerialException, e:
62	print "%s" % (e)
63	sys.exit(1)
64
65	ser.write(SENSOR_QUERY_CMD[options.sensor])
66	buf = ser.read(8)
67	ser.close()
68
69	temp = ord(buf[0]) \| (ord(buf[1]) << 8)
70
71	degrees = temp / 16.0
72
73	if (options.use_celsius):
74	if (options.output_mrtg):
75	print "%.0f" % degrees
76	else:
77	print "%.4f degrees Celsius" % degrees
78	else:
79	degrees = (9.0/5.0) * degrees + 32.0
80	if (options.output_mrtg):
81	print "%.0f" % degrees
82	else:
83	print "%.4f degrees Fahrenheit" % degrees