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

def read_temperature(device, sensor):
  ser = serial.Serial(device, 9600, timeout=1)

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

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

  
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:
  temp = read_temperature(options.device, options.sensor)
except serial.SerialException, e:
  print "%s" % (e)
  sys.exit(1)

degrees = temp / 16.0

# The power-up temperature of the sensor is 85 degrees, which is fairly unlikely
# So if we get that temperature, try reading it again

if degrees == 85.0:
  try:
    temp = read_temperature(options.device, options.sensor)
  except serial.SerialException, e:
    print "%s" % (e)
    sys.exit(1)
  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	apollock	22	import sys
34	apollock	18
35	apollock	23	def read_temperature(device, sensor):
36			ser = serial.Serial(device, 9600, timeout=1)
37
38			ser.write(SENSOR_QUERY_CMD[sensor])
39			buf = ser.read(8)
40			ser.close()
41
42			temp = ord(buf[0]) \| (ord(buf[1]) << 8)
43			return temp
44
45
46	apollock	18	SENSOR_QUERY_CMD = (None, 'S', 'T', 'U')
47			USAGE = "usage: %prog [options] [action]"
48
49			parser = OptionParser(USAGE)
50			parser.add_option("-F", "--fahrenheit", action="store_false",
51			dest="use_celsius", help="Output temperature in degrees Fahrenheit",
52			default=False)
53			parser.add_option("-C", "--celsius", action="store_true",
54			dest="use_celsius", help="Output temperature in degrees Celsius",
55			default=True)
56			parser.add_option("-d", "--device", action="store", type="string",
57			dest="device", help="device to communicate with",
58			default="/dev/ttyUSB0")
59			parser.add_option("-s", "--sensor", action="store", type="int",
60			dest="sensor", help="sensor to query",
61			default="1")
62			parser.add_option("--mrtg", action="store_true",
63			dest="output_mrtg", help="Output decimal value suitable for MRTG",
64			default=False)
65			(options, args) = parser.parse_args()
66
67			if not(options.sensor > 0 and options.sensor <= len(SENSOR_QUERY_CMD) - 1):
68			parser.error("Invalid sensor")
69
70	apollock	22	try:
71	apollock	23	temp = read_temperature(options.device, options.sensor)
72	apollock	22	except serial.SerialException, e:
73			print "%s" % (e)
74			sys.exit(1)
75	apollock	18
76	apollock	23	degrees = temp / 16.0
77	apollock	18
78	apollock	23	# The power-up temperature of the sensor is 85 degrees, which is fairly unlikely
79			# So if we get that temperature, try reading it again
80	apollock	18
81	apollock	23	if degrees == 85.0:
82			try:
83			temp = read_temperature(options.device, options.sensor)
84			except serial.SerialException, e:
85			print "%s" % (e)
86			sys.exit(1)
87			degrees = temp / 16.0
88	apollock	18
89			if (options.use_celsius):
90			if (options.output_mrtg):
91			print "%.0f" % degrees
92			else:
93			print "%.4f degrees Celsius" % degrees
94			else:
95			degrees = (9.0/5.0) * degrees + 32.0
96			if (options.output_mrtg):
97			print "%.0f" % degrees
98			else:
99			print "%.4f degrees Fahrenheit" % degrees