At first I didn't get how he connected Raspberry Pi to the weather station instead of original Davis console. Turns out there are separate gadgets for connecting the sensor suite to a router either via WiFi or cable: <a href="http://www.ambientweather.com/in.html" rel="nofollow">http://www.ambientweather.com/in.html</a> and that takes care of uploading the data to WU. The kit he bought must've included such a link.