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Thanks for the comments! I never thought of trying to do a reversible USB connection. And it's actually quite easy!

The button you point out looks like a better choice. It's about 10 cents cheaper than my current one. Currently sold out with 13 week lead time at Mouser! Must be popular.

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Another version is this: http://www.mouser.com/Search/m_ProductDetail.aspx?R=SKQGADE0...

That one requires more force to press. It's also more expensive, but it's in stock now. It has the same footprint, so it'd be good for prototyping.

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