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 project involves using an Arduino to measure distances using an ultrasonic sensor and controlling a buzzer and LED based on the measured distance. The provided Arduino code performs the following ...

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 ...