Since I have more than 16 stations, I purchased a "TIAO Smart Sprinkler 16 Station Expansion Board Zone Expander". However, the notice on the page said "This expansion board is compatible with Open Sprinkler Controller. However this expansion board is NOT compatible with TIAO Smart Sprinkler Pi V1 or V2." Can anyone tell me why it is not compatible and what would it take to make it compatible? I really do not want to put in two separate RPis.