Gammon forum : electronics : microprocessors : using a keypad matrix Projects for you: 4x4 matrix keypad 4x4 keypad module pinout, configuration, features, circuit & datasheet
8051 Keypad Interfacing Tutorial (4x4 and 3x4 Keypad) ⋆ EmbeTronicX
Using i2c with a 4×4 matrix keypad
Interface 4x4 matrix keypad with microcontroller
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How to set up a keypad on an arduino
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Connect a 4x4 keypad to one arduino input
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