I realize this thread is a bit old, but are the blank PCBs for this thing still available? The link to OSH Park is dead but if I could get the gerbers I can have some boards made, or a schematic to do my own layout.
Unfortunately the dataflash chip is obsolete, although they still can be found for now. Does anyone know what Davis is using in the current production loggers? Have they gone to a new part or do they have a hoard of the original chips? The firmware in my Vantage Pro2 console is 3.6something, does it still authenticate the flash chip? It's really irritating that they do that, I don't mind paying the premium prices for the equipment because it's quality stuff made here in the USA but I hate being gouged for a feature that comes standard practically every $100 Chinese weather station on the market these days. The Davis approach to exporting the weather data is very 1995.