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4X4 Matrix Keypad Module - Wiki
Keypad Interfacing with 8051 Microcontroller (AT89S52)
How to use 4X4 matrix keypad with Arduino - Ettron
4x4 Matrix Keypad Module - 16 Keys | How it’s Works » ElectroDuino
Interface 4x4 Matrix Keypad With Microcontroller - EmbedJournal
arduino mega - 4x4 matrix keypad - Multiple inputs cause extra readings
Read a 4x4 Matrix Keypad | LEARN.PARALLAX.COM