For the small difference in price I really like the official arduino.cc products. There is a new variation of the Uno, I would use the latest version of the original standard Uno design. Same with the relay shield, arduino.cc rather than 3rd party or individual relays. Makes for a single unit to deal with and pins should match up with the ones pre-defined in the rolloff.ino.standard example. More than needed but quality and reliable. I would recommend getting the 12V supply to power the Uno not try to rely on the USB input. I'll look at the links you provided and check the rolloffi.ino.standard code tomorrow evening. Will check pin assignments and the input pins to use by default.

If you are going to build an Arduino based weather station, think in terms of a different/additional Arduino. Which model can be selected when you select the approach or product. INDI will coordinate with roof. Likely a Mega will be more than needed.

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