A standard telephone keypad, with four rows of three keys each. The top row consists of 1, 2, and 3, with keys continuing down in order until the last row, which is usually *, 0, and #. Such a keypad ...

This Arduino library provides easy-to-use functions for interfacing with a 4x4 keypad. The library is designed to be flexible and customizable, making it suitable for various Arduino projects that ...