meh, keymasta.

(click me to see where I reside at the moment)
I can has some nice graphz?
Hi ya. What we have here is a PIV 2.4GHz on a VIA-EPIA-type mobo measuring 17x17cm, plus a SATA controller,
fitted into a industrial-kinda chassis, and stuffed with two 250GB Seagate drives.
The story
This set has undergone a few slight modifications. Basicly I bought the board with the cpu, chassis and psu at
the DeAnza flee market in sunny old Cal (for $30, not bad, eh?). I put a radiator with a fan on it, but then
it was roaring like a wounded
Spitfire. A way around had to be found, as hearing the sound I wasn't spellbound.
A bit of of googling led me to a package called
lm_sensors. However, after install I was only able to see how fast the cpu fan goes,
and that I could hear well enough already. The pdf for the chip that pulls the strings of fans and stuff alike,
called
IT8712F in my case, reveiled that the controll is in fact possible, but the PWM outputs don't seem to be wired to the fans.
To see if that was true, I soldered a few wires to the appropriate pins and decided to test them using an old RGB led I bought some time ago
and never had time to play with. Three PWM output pins, three colors, great. And guess what, It actually worked!
here's a silent video:
rgb.avi and another one with the sound on if you'd rather hear why I care to make it quiet:
rgb_sound.avi (both around 400KB).
Next step was to put some power switching FET on each wire to be able to drive a larger load than a simple led.
I had two
BUZ11 laying around, and took one
IRFZ34N from an old sumo robot controller board I was no longer using.
Luckily both parts have a protection diode inside, so I only needed one current-limiting resistor on the MOSFET's gate,
and one pull-up, as PWM outputs of the chip are open-drain kinda fellas.