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A 1-wire temperature sensor (DS18B20) UTP/RJ45 installation.

(the next one will probably be smaller ;))
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I did roughly the same thing, but did it with an RJ-11 form-factor so I could use phone cords.  Nice work!
I do use basicaly the same design since some time now, but without the resistor (something new in 1-wire design guide). Pleas shed a light
You may need a capacitor close to the sensor if running on long cable to help stabilize the power feeding it
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