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You may want to check out brewpi - it's a fermentation monitor, but isn't limited to just fermentation. The temperature devices used are DS18B20 temperature probes. You can get these pre-made in waterproof housing from sellers on ebay - the project also has a shop that sells them. The manufacturers claim they are accurate to +/- 0.5 C, although my tests ...

You are doing the right thing. Ambient temperature (aka the air temperature inside the chest) can go low like this, but since the probe is taped to the fermentation vessel, and the controller is calling for chilling, then chilling is what is needed. The thermal mass of the chest walls, cooling tubes, freon, and the air in the chest all might be below your ...

As long as the stainless part of the probe is the only part that will be in the liquid, I believe you will not need a thermowell. A thermowell is generally used to protect a non-submersible probe or thermocouple. Image source. It's also good for getting deeper into the carboy than your probe will allow. E.g. I use a 24" thermowell in my conical to reach ...

I'm actually in the exact same boat. Well.. Similar. Wasn't going to bother with the smartphone, but will have some form of communication. Here's what I have in mind I just ordered a USB Thermometer off Amazon that people have managed to get working in linux (specifically Ubuntu, but it sounds like it is agnostic to distros). From here I could whip up ...

If you are into brewing (daa) and want to get your hands dirty(er) (into programming and electronics) you migth check "the electric imp" a relative simple and small datalogging device. It's well documented, user friendly, web avaliable and It also connects to your home wifi Here is a full instructable implementing a temperature web sensor. Total cost: ...