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LilyPad ProtoSnap Plus Hookup Guide - learn.sparkfun.com
https://learn.sparkfun.com/tutorials/lilypad-protosnap-plus-hookup-guide?_ga=2.234157401.659504291.1516640116-204410570.1509632255
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Alligator clip attached perpenticular to the expansion port.
A LilyPad temperature sensor attached to the LilyPad ProtoSnap Plus expansion ports for testing.
Using Expansion Port A9
You may have noticed that tab A9 is connected to both the LilyPad Slide Switch and an Expansion Port. You can only
use A9 for one of these connections; either the switch as an input or the expansion port as an input/output.