I’ve updated temper-mon and my Cacti templates to better work with the TEMPerNTC device, which has an external temperature sensor in addition to the internal one.
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I graph the temperature of my server cabinet (at home) and colocation room (at work) in Cacti, using TEMPer USB thermometers. I wrote a handy guide to doing this last year. Unfortunately that guide, and the software I wrote, only worked to query one device. Today I modified it to graph more than one device, and started graphing the ambient temperature of my house.
Update 2012-07-25: These instructions have been (mostly) superseded by a new version of this guide. Follow that document instead.
I recently acquired a TEMPer USB thermometer. It’s a cheap, convenient way to measure temperature in your server closet or machine room. My home “server closet” consists of the living room entertainment center, which is an enclosed wooden structure. It gets pretty hot, so I decided to track the ambient temperature with Cacti.