4 x 4 keypad reader using a single I/O pin

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By: Chris Gadd, created: 2013-10-10 | updated: 2014-07-08

This object uses a single I/O pin to read a 4x4 numeric keypad (8-pin header type) by measuring an RC circuit.

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4 x 4 keypad 1-pin.spin14.37 KB