Quote:
Originally Posted by jeff5may
If you are throwing together an arduino board to be a thermostat, consider using a Dallas/maxim sensor. They are pretty darn accurate and don't drift or bounce around like a thermocouple or thermistor.
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The Arduino (Teensy) controller I built for my Freezerator did use a Dallas/maxim "1-Wire" sensor.
So 1-Wire is already in the Freezerator code.
In actual practice, I found that I was having occasional spikes that caused the compressor to start more often that it really should have. And that is why I included the 'smoothing' algorithm in the code.
I have pretty clear code for an LCD display in my
CO2 sensor project thread.
In fact, the code is
HERE.
Shouldn't be too hard to merge.
I went with a little LCD display because it was so easy to get code and to interface.
As the project progressed, I added a precision temperature and humidity sensor which allowed the calculation of relative humidity, so I got a larger display to show that information, too. I was thinking that my HRV controller might be programmed to respond to both CO2 and humidity. For your Freez-Frig, it wouldn't be needed.
Then there are BIG LED displays that would be more nifty, but you might need to do more thrashing around to gain that added degree of niftyness.
Best,
-AC