I am pleased to announce that CPUClock version 2.08 is now available.
This new version has an additional facility for switching a Raspberry
Pi fan on or off, depending on the cpu temperature (see below for more information).

CPUClock is available via a package manager, such as !Packman, and
from PlingStore. The latest version should already be listed in these applications.

If you wish to download directly, then the urls to use are

http://www.chrisjohnson.plus.com/software/cpuclock.html
or
http://www.chris-johnson.org.uk/software/cpuclock.html

What is CPUClock?
-----------------

CPUClock is only of use on modern native hardware, and is known to
work on the BeagleBoard, PandaBoard, IGEPv5, Titanium, and
RaspberryPi. It will not run on older hardware, nor under any form of emulation.

On modern hardware, the CPU speed is automatically switched between a
slow and fast speed, depending on how hard the CPU is asked to work.
When the wimp is 'idling', the CPU speed is throttled back, but when
working hard processing, the speed is switched up. One effect of
reducing the CPU clock speed is that the silicon runs cooler.

CPUClock operates in a number of ways. It displays the 'current' cpu
speed (by default updated every second). In normal use you can see the
cpu changing clock speed as you do things in the desktop. CPUClock
also displays the temperature of the CPU silicon die. This will be
seen to change with CPU load, increasing when the CPU is clocked at
the fast speed. Besides simply displaying CPU speed and temperature,
CPUClock can automatically reduce the CPU clock speed if the CPU
temperature rises excessively. The trigger temperature, and fast speed
used can be set by the user. The core functionality of CPU temperature
control is in the CPUClock module, rather than the GUI front end. This
means the regulation continues even if the wimp goes in to single
tasking mode when carrying out intensive processing.

CPUClock now has the additional facility of fan control on a Raspberry
Pi. The fan must be driven from the GPIO, using the 'official' pin for
the control signal. The fan on and off temperatures are user set and independent of the temperature settings for cpu speed control.

CJEMicros supply a real time clock (RTC) module, which may be fitted
to computers supplied by them (e.g. PandaRO, RapidO Ig, and
RaspberryPi models). The module can also be user fitted to the bare
boards. Not only does this provide a hardware real time clock, it also
contains a temperature sensor, which effectively gives the 'case
temperature'. CPUClock will detect the presence of the RTC module, if
fitted, and will display the case temperature as well as the cpu die temperature.

--
Chris Johnson
Edinburgh



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