Dealextreme has cheap USB-temperature sensors (Winchiphead‘s CH 341 chip) – http://www.dealextreme.com/details.dx/sku.7003

The windows drivers and monitoring software provided aren’t that good but luckily there’s better free alternatives – http://www.n4rf.net/solutions/utac.

Linux support is a bit different. One must have a recent kernel with a proper patch to enable device readings plus a software for reading the temperature.

I googled a bit and found a kernel-patch and a program (which is quite basic), it just reads the temperature in a loop from a single device. I modified the program a bit to enable multiple devices and specifying the temperature correction factor from command line. The kernel patch is also included.

Here is the package. Please leave a note if you need  advice or have suggestions.

Sample graph;


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