lm_sensors a free

Free software

Free software, software libre or libre software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions that only ensure that further recipients can also do...

 open source

Open source

The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...

 software-tool for Linux

Linux

Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

, provides tools and drivers for monitoring temperature

Temperature

Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold. Objects of low temperature are cold, while various degrees of higher temperatures are referred to as warm or hot...

s, voltage

Voltage

Voltage, otherwise known as electrical potential difference or electric tension is the difference in electric potential between two points — or the difference in electric potential energy per unit charge between two points...

, and fans

Computer fan

A computer fan is any fan inside, or attached to, a computer case used for cooling purposes, and may refer to fans that draw cooler air into the case from the outside, expel warm air from inside, or move air across a heatsink to cool a particular component...

. It also monitors chassis intrusion detection.

decode-dimms.pl decodes and prints information on any RAM memory module with SPD

Serial Presence Detect

Serial presence detect refers to a standardized way to automatically access information about a computer memory module. Earlier 72-pin SIMMs included 5 pins which provided 5 bits of parallel presence detect data, but the 168-pin DIMM standard changed to a serial presence detect to encode much...

 information in the computer.

It contains a library called libsensors with an API

Application programming interface

An application programming interface is a source code based specification intended to be used as an interface by software components to communicate with each other...

 that applications can use. It contains a daemon

Daemon (computer software)

In Unix and other multitasking computer operating systems, a daemon is a computer program that runs as a background process, rather than being under the direct control of an interactive user...

 called sensord which supports RRD

RRDtool

RRDtool aims to handle time-series data like network bandwidth, temperatures, CPU load, etc...

.

lm-sensors 3 requires Linux kernel

Linux kernel

The Linux kernel is an operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software....

 2.6.5 (released in 2004) and later.

lm-sensors 2 requires Linux kernel

Linux kernel

The Linux kernel is an operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software....

 2.4 (released in 2001) and later.

Software like GKrellM

GKrellM

GKrellM is a computer program based on the GTK+ toolkit that creates a single process stack of system monitors. It can be used to monitor the status of CPUs, main memory, hard disks, network interfaces, local and remote mailboxes, and many other things. Plugins are available for a multitude of...

, KSensors, xsensors and Net-SNMP

Net-SNMP

Net-SNMP is a suite of software for using and deploying the SNMP protocol . It supports IPv4, IPv6, IPX, AAL5, Unix domain sockets and other transports...

 make or can make use of lm-sensors.

It has support for intrusion detection and humidity sensors.

Example output

$ sensors

coretemp-isa-0000

Adapter: ISA adapter

Core 0:      +51.0°C  (high = +78.0°C, crit = +100.0°C)



coretemp-isa-0001

Adapter: ISA adapter

Core 1:      +49.0°C  (high = +78.0°C, crit = +100.0°C)



f71882fg-isa-0a00

Adapter: ISA adapter

3.3V:        +3.30 V

Vcore:       +1.21 V  (max =  +2.04 V)

Vdimm:       +1.82 V

Vchip:       +1.38 V

+5V:         +5.00 V

12V:        +14.37 V

5VSB:        +4.33 V

3VSB:        +3.30 V

Battery:     +3.22 V

CPU:        2035 RPM

System:        0 RPM  ALARM

Power:         0 RPM  ALARM

Aux:           0 RPM  ALARM

CPU:         +31.0°C  (high = +85.0°C, hyst = +81.0°C)

                      (crit = +50.0°C, hyst = +46.0°C)  sensor = transistor

System:      +29.0°C  (high = +85.0°C, hyst = +81.0°C)

                      (crit = +100.0°C, hyst = +96.0°C)  sensor = transistor

See also

• i2c-tools split from lm_sensors
• I²C
  I²C
  I²C is a multi-master serial single-ended computer bus invented by Philips that is used to attach low-speed peripherals to a motherboard, embedded system, cellphone, or other electronic device. Since the mid 1990s, several competitors I²C ("i-squared cee" or "i-two cee"; Inter-Integrated Circuit;...
  
  
• SMBus
  System Management Bus
  The System Management Bus is a single-ended simple two-wire bus for the purpose of lightweight communication...