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The Proto Expansion for the Onion Omega allows you to create your very own Expansion that interfaces with your Omega. It provides a small soldering area and a 30-pin header that plugs into the Expansion Dock. With it, you will have complete control over what kind of project you design for your Omega.
Note: This Expansion requires a Dock with an expansion header, such as the Expansion Dock, Power Dock, or Arduino Dock R2.