The 4x4 Keypad Matrix (Yellow Button) is an essential input device for hobbyists, students, and engineers in Bangladesh. With 16 responsive yellow keys, it’s designed for easy integration into Arduino, Raspberry Pi, PIC, and other microcontroller projects. This keypad is widely used in home automation, robotics control, password systems, and embedded applications. Its compact size, durable build, and reliable performance make it a go-to component for prototyping and academic projects. Whether you’re building a security lock or a custom control panel, this keypad adds both functionality and style to your project.