This is the **DS18B20** fake emulator provided with the original version of OneWireArduinoSlave. To make it working, connect : - a GND pin of your Uno to your 1-wire network ground. - the pin "2" of your Unto to the data line of your 1-wire network. You may use "3" as well but need to change the code. You will see 28.000000000002 probe that always return 42 as temperature : $ cat 28.000000000002/temperature 42 Notez-bien : conversion timing is emulated as well.