GitHub - 0ctobyte/numpad-msp430: Code to interface a 4x4, 16 key matrix membrane numpad with a msp430 mcu. Outputs result to an array of four LEDs, which represent a binary value corresponding to
Matrix membrane keypad
RUGGED RKP-SS-MK Keypad - RUGGED
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Gammon Forum : Electronics : Microprocessors : Using a keypad matrix