keypad pinpad data logger

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    4x4 matrix keypad data logger // Матрицу 4x4 клавиатура регистратор данных

    What components is needed to buit a 4x4 keypad data logger. It must be small as possible to hide the circuit behind the 3 unused touch on 16 of the keypad. Behind the others touch used (13) it's possible to hide the matrix keypad built with mini buttons interconnect by wire...