Compact 4x4 16Key Keypad Module for MCU Prototyping Overview This 4 by 4 matrix keypad provides 16 individual button inputs while using only 8 pins, making it an efficient input solution for microcontroller projects and breadboard prototyping. The module is designed for straightforward wiring and integration into DIY kits and MCU setups such as Arduino. Key benefits Reduces I/O usage: 16 keys arranged in a 4x4 matrix require only 8 signal lines, freeing up microcontroller pins for other functions. Breadboard friendly: Standard header pinout fits common breadboards and prototype boards for quick testing and development. Easy integration: Compatible with standard keypad scanning routines and common libraries for microcontrollers, speeding up development time. Reliable input for control and navigation: Physical button keys provide clear tactile feedback for user input and menu navigation. Features and attributes Configuration: 4x4 matrix providing 16 individual keys. Pinout: 8pin header for row and column connections. Function: Sends row and column signals for matrix scanning to detect key presses. Compatibility: Designed for MCU projects including Arduino and other microcontrollers that support matrix key scanning. Form factor: Compact module suitable for breadboards and small prototypes. Performance: Simple, consistent key detection when used with standard scanning code or libraries. How it solves common prototyping problems Saves microcontroller pins by multiplexing keys into a matrix arrangement. Simplifies wiring and layout when adding a keypad to tight prototypes. Removes the need to design a custom keypad circuit, allowing focus on application logic. Typical applications Secure access panels and code input for DIY door lock projects using Arduino controllers. Menu navigation and user input for home automation controllers, instruments, and control panels. Numeric entry and command input for robotics projects, calculators, and handheld devices. What you get One 4x4 matrix 16key button keypad module with an 8pin header for easy connection to breadboards and microcontrollers. Usage tips Use standard matrix scanning algorithms or available keypad libraries for faster implementation. Connect the 8 pins to digital inputs configured with either pullup or pulldown as required by your scanning routine. Debounce in software if your application requires fast or repeated key presses. This keypad module is a practical, compact input device for a wide range of MCU based DIY projects, offering straightforward compatibility with Arduino and similar platforms while minimizing pin usage and simplifying prototyping.