Yo Achim! On Tue, 25 Apr 2017 12:34:52 +0200 Achim Gratz <strom...@nexgo.de> wrote:
> So, just before I left last week I managed to finally set up a
> temperature controller on my rasPi 3B using three sha512sum processes
> that get individually stopped and continued by the temperature control
> loop every 100ms to create a load between 0% and 300% and put it into
> another cardboard box and bubblewrap.
Cool. Did you use ntpheat?
> I still have to add an integral
> term to the control loop in order to make the residual zero
ntpheatusb already has a full PID controller. Did you look at that?
> and add a
> few other things to enable changing the setpoint while it's running
> and improve the logging,
If yu do so, could you send us patches for ntpheat?
> but it already converges to within 0.2K of
> the target temperature and keeps the 5 minutes average temperature to
> within 20mK or so (unless something else loads the cores for more
> than just a few seconds, like compiling a new NTPsec version).
I found that keeping the CPU chip temp stable was less important that\n
keeping ambient stable. The XTAL is on the other side of the PCB
from the CPU.
I also found adding a fan to the box evened out the temps between
PCB top and bottom better.
> Since
> I was away I have data for nine days of uninterrupted and undisturbed
> performance:
Very nice. What is the 'NTP Loop Offset'? The Time offset?
How is the predicted frequency offset calculated? Could that be patched
into ntpviz?
RGDS
GARY
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