Hi James! You neither need a Grove Cape nor any other additional hardware. Just configure header pins as GPIO input with pull-up resistor and connect simple buttons to pull the pins down to ground when pressed. Check out the button example <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/> in the libpruio project <http://beagleboard.org/project/libpruio/>.
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