This weather station is a Raspberry PI model Bs with a SHT75 sensors attached. The SHT75 is a high accuracy temperature and humidity sensor. The Raspberry PI and transformer are in the extra-deep outdoor in-use outlet cover. The SHT75 is in a separate box, so that the heat from the transformer and CPU don’t affect the temperature readings. This is connected to my network using an Edimax EW-7811Un, which is an incredibly tiny wifi adapter. An 8GiB SDHC card and some CAT3 cable rounds out the package, which tips the scale at $100.
I have two of these, one inside and one outside, which will allow me to graph the temperature, humidity, and dewpoint inside and out of my apartment. I hope to keep this going for at least a year, so that I can get data from all of the seasons.
Part of this is to see how my thermostat is behaving/performing.