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 <mi...@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. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- --Eric _________________________________________ Eric Garner _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.