[time-nuts] Achievable temperature stability for Thunderboltenvironment

WarrenS warrensjmail-one at yahoo.com
Mon Jan 17 00:29:12 UTC 2011


Lady Heather has a built in software PID Temperature controller.
The setpoint to the PID is done using the  "TT" command,
the feedback is from the Tbolt's temperature sensor and 
the output is a 1 sec PWM signal that comes out on pin 4 (and others?)

The real problem is to try and find the doc on how to use it all.
I'll leave that answer to others.



[time-nuts] Achievable temperature stability for Thunderboltenvironment?
Kevin Rosenberg kevin at rosenberg.net 
Mon Jan 17 00:12:40 UTC 2011 

On Jan 16, 2011, at 4:46 PM, WarrenS wrote:
> I don't know if this low resolution picture will post correctly.
> If anyone wants a high resolution view of the H/W,
> or an expanded plot showing the results over a 2 week period, 
> I can provide them, if someone will send me the name of a site to post them at.

The photo and schematic were clear, thanks for posting! I see that you have
the fan controlled by pin 4 of the RS-232. Is there a mechanism in Lady Heather
to control pin 4 (DTR) based on temperature readings? Or, maybe you monitor the
temperature and control pin 4 with some other monitor/control program using an
output different that the RS-232 port controlled by Lady Heather?

Anyway, that's a great looking temperature plot, and the implementation is nicely
simple. Lots of bang for that buck!


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