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What does "stackable" mean for headers?

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Beginner's question here:


The Stellaris Launchpad has "stackable headers". What does that mean? Does it mean I can use more than one Booster Pack on the same Launchpad? I would think that each pin could only act as one input/output, so what would be the purpose of "stacking"?

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Lets call each stackable board a layer.


Layer one is your LP.

Layer two is your transmission booster pack.

Layer three is your LCD board.


Some pins you use on layer 2 and others on layer 3.

It doesn't mean that all the pins are used on each layer, they are just passed through to all the layers.

This is mostly interesting when you create your own boards.

That way you can control the used pins.



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