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Using I2C with a 4×4 Matrix Keypad - Maker and IOT Ideas
Arduino: Library for multiple keypads – Hobby Components Blog
Arduino Keypad: Interfacing with 4x4 Matrix | Microcontroller Tutorials
Les 26 - 4x4 matrix keypad
8051 Keypad Interfacing Tutorial (4x4 and 3x4 Keypad) ⋆ EmbeTronicX
Simulate a matrix keypad with a microcontroller - Page 1
4x4 Matrix Keypad Module - 16 Keys | How it’s Works » ElectroDuino
Read a 4x4 Matrix Keypad | LEARN.PARALLAX.COM