This is a casual pic of my quick test setup (DS18B20 + Arduino Uno + Uno ProtoShield). It worked! How to Detect Counterfeit DS18B20s? You may get counterfeit DS18B20 sensors (bare chips or waterproof ...

An Arduino measures the temperature of the room via a DS18B20 temperature sensor which then has the servo turn the control knob to the appropriate position, on or off.