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If you are looking at platinum probes for temp...i.e pt100 it may pay to look at pid loops for control!!! If you want precision may as well go full out! You could use a solid state relay on pwm to pulse heaters with a pid loop and practically keep a tank precisely where you want.DHT22 is in my plan as well. I prefer i2c because it requires no additional circuit and software logic beyond the sensor's protocol. The price is generally not an issue if its only 5-10$ difference. If its more precise, its better (within 5-10$ margin). When I integrate a new thing my general goal is to get an end to end flow going first. In this case getting to see humidity trend, correlating it with other signals to make sure this makes sense.,. check general stability (software wise) etc. I find i2c based sensor pretty handy. They are generally better quality and software, electronics requirements are lesser. i have my eyes on the platinum temp probe as well.
That being said, my 75 generally stays within +-.1 degrees with the good drok sensors I got, checking the temp every 60 seconds with hysteresis set at .2.



