First, fire up the Arduino IDE, load the provided .ino file and burn the sketch to an Uno (or other, IDE-compatible) board. Hardware-wise, you will need an analog thermometer (tested with an MCP9700A) hooked up to Analog Input 0.
Ensure that all the required modules are installed (this is going to be easier when a package.json is provided):
npm install socket.io serialport
Next, launch the provided server:
node daemon.js
Finally, if everything went right, you should be able to navigate to the Web interface and see the real-time results:
http://localhost:1337/client.html
Enjoy!