On Friday 13 July 2007 23:55:39 Eben King wrote:
> On Fri, 13 Jul 2007, Ian C. Blenke wrote:
.......<snip some>,,,,,,
> > Also, no two sensors are the same. Each sensor is manufactured within a
> > certain tolerance range, but the readings WILL DIFFER from sensor to
> > sensor. This means that you WILL need to alter any sensor.conf file you
> > find with adjustments that fit your specific sensors.
>
> Unless you know what the _actual_ fan speed/temperature/voltage is, you
> have no hope of calibrating the sensor. And you need two points if it's
> not off by an offset. And more, if it might not be linear.
>
> So I said "screw all that", normalized the sensor readings to what it
> _should_ be, then watch for deviations from that. I wrote some cron /
> shell / gnuplot scripts that make 1-week graphs of related readings, so I
> can spot trends easier. True, when it says "40C" it might not actually be
> reading 40C, but that's not as important as "is it rising / falling /
> twitching" which the graphs show accurately.
>
> It's pretty cool. I can see that parts of the machine get hotter when I
> open the side cover (mainboard, I think); and that all temps vary in
> lockstep when the house switches from cooling to heating (for a few days
> the temperature "floats").
Like you, I just want to know when something goes out of the "normal" range.
lm_sensors is supposed to send an alarm email to root which is forwarded to
me. Thanks for your thoughts/experience with the sensors.
Bob S.
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