[time-nuts] FE5680 GPS Disciplined Controller Update
Mark Sims
holrum at hotmail.com
Tue Jun 24 22:24:52 UTC 2014
Check out the temperature control code in Lady Heather. It uses a nice PID controller algorithm (from Warren Sarkison) to PWM modulate a fan to stabilize the environment around the Tbolt. It can achieve millidegree range stability... I have seen long term RMS values of the temperature plot less than a few micro-degrees. The standard Tbolt oscillator has a rather horrible tempco...
I'll post some recommendations/findings about various environmental sensors I tried while I was building my weather/envionmental sensor package. Hint: the MS5611 pressure sensor chip is very nice. Has 24 bit ADCs for the pressure and temperature readings and produces very stable readings with a 100 Hz update rate.
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However it is disappointing that no one has stepped up to tackle the
temperature problem.
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