I would think that after all is said an done. You would be better off buying an ethernet controller or PLC that has analog inputs and use a thermocouple or RTD input to the controller. I would question the accuracy of a DIY thermometer. Not all electronic components have the same tolerances. You might want to look at X10 or maybe some industrial PLC stuff at automationdirect.com.
To drink, or not to drink??? That is the....gulp, gulp, gulp. Nevermind!
Primary: EdWort's Apfelwein, Scottish Ale
Conditioning: Oatmeal Stout
On the shelf: Copper Ale, Ginger Porter, Sweet Stout (it sucks...future fertilizer)