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Changes to Step #16

Edit by Scott Havard

Edit approved by Scott Havard

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[* black] The sync button is a self-contained li'l clicky dude, with contacts that match up to some spring contacts on the main board.
[* icon_note] Electrical switches can be complicated. This one, however, probably isn't. It is likely a [http://www.allaboutcircuits.com/textbook/digital/chpt-4/switch-types/|pushbutton switch|new_window=true]. A press of the button closes the circuit and lets the current flow. This current will flow into the circuit and be interpreted as input.