digitemp - program to read from temperature sensors.

digitemp [options]

DigiTemp uses the Dallas 1-wire bus to read temperatures from digital sensors attached to a serial port adapter. It handles initializing the bus, searching for attached devices, reading devices and custom log strings. It suports the following temperature devices: DS1820, DS18S20, DS18B20, DS1822

It also handles the DS2406 1-wire hub switches, and DS2422 and DS2423 counters.

DigiTemp uses either the DS9097 passive serial port adapter, or the DS2480B based DS9097U adapter (recommended).

At least 1 action must be given, along with some optional arguments. Actions are one (and only on) of the -w -t -a -w options

-h, -?

Show summary of options.

-v

Show verbose output.

-i

Initialize .digitemprc file, search the bus for all supported devices.

-w

Walk the full device tree and display the serial number and type of all devices detected on the bus.

-s /dev/ttyS0

Set serial port to use. Make sure you have permission to access this port.

-l /var/log/temperature

Send output to logfile, the output format is defined by the .B -o command

-c digitemp.conf

Set digitemp configuration file. The default is .digitemprc in the current directory.

-r 1000

Read delay in ms. This sets the amount of time to wait between sending the temperature conversion command and reading the result. The DS18S20 takes about 750mS to do the temperature conversion. Default is 1000mS (1 sec).

-t #

Read sensor number #, the # depends on the order of the sensors in the

-q

Quiet output, no copyright banner.

-a

Read all sensors.

-d 5

Delay between samples (in seconds).

-n 50

Number of times to repeat the command.

-O" counter format string"

See Counter Format below.

-o [1..3] [" output format string" ]

See Temperature Format below.

The temperature format can be either a numeric value, or a string. The numeric values select pre-configured output formats:

1 = One line per sensor, time, C, F (default) 2 = One line per sample, elapsed time, temperature in C 3 = Same as #2, except temperature is in F

#2 and #3 have the data seperated by tabs, suitable for import into a spreadsheet or other graphing software.

The format string uses strftime tokens plus 5 special ones for DigiTemp:

%s

for sensor #

%C

for centigrade

%F

for fahrenheit

%R

to output the hex serial number

%N

for seconds since Epoch.

The case of the token is important! The default format string is: "%b %d %H:%M:%S Sensor %s C: %.2C F: %.2F" which gives you an output of: May 24 21:25:43 Sensor 0 C: 23.66 F: 74.59

The counter format string is similar, adding these tokens:

%n

is the counter #, which depends on its position in the .digitemprc file

%C

is the count in decimal.

This manual page was written by Jesús Roncero <jesus@roncero.org>, for the Debian project (but may be used by others). Modifications by Brian C. Lane

DigiTemp updates can be found on the http://www.digitemp.com website.