scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.
Fork of keypad by
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Dimiter Kentry update. Eliminate one column and add software pulldown resistors
2015-05-08, by fangoman91 [Fri, 08 May 2015 06:50:54 +0000] rev 1
Dimiter Kentry update. Eliminate one column and add software pulldown resistors