[time-nuts] Thunderbolt mounting
Eric Garner
garnere at gmail.com
Thu Jul 12 03:11:01 UTC 2012
Mike:
Lady Heather implements a PID temp control feature using the "TT" command.
from lady heather's heather.cpp file:
// - Added ability to actively stabilize the device
// temperature. (/TT=degrees or TT command line option).
// Uses the serial port RTS and DTR lines. RTS is the
// temperature controller enable (+12=off, -12=on)
// DTR is the heat (-12V) / cool (+12V) line. Simple
// implementation: Isolate tbolt in a box, set control
// temperature below typical unit operating temp and
// above normal room temp, when unit signals COOL turn
// on fan to move room air into the box. You want the
// fan to move enough air to cool the unit, but not so
// much air that the temperature drops by more than 0.01C
// per second. The indicator of too much airflow is a
// temperature curve that spikes down around 0.1C several
// times per minute. Too little airflow shows up as a
// curve that oscillates around 0.25C about set
point over
// a couple of minutes. Good airflow should show a
// temperature curve stable to with 0.01C with
a period of
// between 1 and 3 minutes. Generally you do not want
// the fan to blow directly on the unit (mine
is surrounded
// by foam). You want to gently move air through the
// box. It can help to include a large thermal mass in
// the box (I use a 2kg scale weight).
-Eric
On Wed, Jul 11, 2012 at 7:00 PM, Mike S <mikes at flatsurface.com> wrote:
> On 7/11/2012 8:15 PM, Chris Wilson wrote:
>>
>> Does anyone know if there's a means to log max and min temps for these
>> things? I was going to make a crude box for mine out of 2 inch cavity wall
>> insulation hard foam,
>
>
> The TB reports it's own temperature. Lady Heather will track it.
>
> I'm surprised no one has mounted one to a Peltier cooler, and stabilized the
> temp with PID control, based on the self-reported temp. Why not run it
> cooler than ambient? I'd assume a simple microcontroller could handle the
> task, but don't have any deep PID control knowledge myself.
>
>
>
>
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--
--Eric
_________________________________________
Eric Garner
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