It all started with that I wanted to keep track of the temperature in my DataCenter, called PDC (Peters DataCenter), in my basement. I have a couple of computers running 24×7 and if the doors are closed and the outdoor temperature is hot it can get very warm. I have an op5 Monitor system that monitors the temperatue and sends SMS messages and emails if the thresholds are broken.
The first alternative, Sensatronic probes was to expensive for a project like this. After some investigation I stumbled over 1-wire technology and found an excellent shop in Sweden.
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