This is a common implementation for keypads, and if you have been researching this topic for some time, you are likely aware that the most common approach involves using either the rows or columns as ...

To Interface a 4X4 matrix keypad and show the output on 16X2 LCD display to ARM controller , and simulate it in Proteus 4×4 Keypad Module Pin Diagram 4x4 Keypad module Pin Diagram 4×4 Keypad module ...