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Re:Spark Core: Wi-Fi for Everything (Arduino Compatible) by mmastrac on Thursday May 02, 2013 @07:24PM (#5647867)
I recommend this one:

http://www.monoprice.com/products/product.asp?c_id=105&c...

It worked with zero extra setup on my Pi. Plugged directly into Pi - no hub.

Re:Spark Core: Wi-Fi for Everything (Arduino Compatible) by StavrosK on Thursday May 02, 2013 @07:31PM (#5647912)
I'll give it a shot, thanks! It's possible that my USB adapter doesn't supply enough power, though, so I'll try a bigger one first.