1PCS 8pin 4x4 Matrix 16Key Keypad Breadboard Module for MCU Key Benefits Ready to use input interface for microcontroller projects. Provides 16 distinct button inputs using a compact 4 by 4 matrix and a single 8pin connection. Breadboard friendly design simplifies prototyping and testing. Connect directly to a breadboard and an MCU for immediate interaction without complex wiring. Reduces GPIO usage. Matrix scanning lets you read 16 keys while using only eight MCU pins, saving resources for other sensors and modules. Reliable manual input for menus, PIN entry, navigation, and control tasks. Physical buttons give predictable, low latency responses for user interfaces. Main Features Configuration: 4x4 matrix layout providing 16 individual buttons. Interface: 8pin header for direct connection to microcontrollers that support matrix scanning. Form factor: Module designed for breadboard integration and quick prototyping. Function: Acts as a simple keyboard input device for digital projects and embedded applications. Compatibility and Use Designed for use with common microcontroller platforms that support GPIO scanning of matrix keypads. Use with microcontrollers for hobby, education, and development projects. Works with standard breadboards and typical jumper wiring setups for fast hardware assembly. Why this module solves problems Simplifies input wiring by consolidating 16 keys into a single 8pin connection, reducing clutter and wiring errors. Speeds up development by delivering a ready built keypad module so no need to solder individual switches or build a custom matrix. Improves prototype reliability compared to makeshift button arrays because the module provides consistent spacing and fixed mounting for each key. Practical Applications DIY security panel or door lock prototype using numeric PIN entry. User interface for robotics or automation projects to navigate menus and send commands. Educational electronics labs for learning matrix scanning, debouncing, and human machine interface design. What you get One 4x4 matrix 16 key keypad module with 8pin header ready for breadboard use. Clear function and wiring approach so integration with MCU code and wiring is straightforward. Notes for use Ensure your microcontroller code implements matrix scanning and debouncing for reliable key detection. Confirm pin assignments match your MCU input pins before powering the circuit.