Product: 12 Key MCU Membrane Switch Keypad 4 x 3 Matrix Array Matrix Keyboard Module Overview A compact 12 key membrane keypad designed as a 4 x 3 matrix keyboard module for use with MCU based systems. The membrane switch construction delivers a low profile, flexible input surface that integrates cleanly into embedded projects and control panels. Key benefits Simple MCU integration: Uses a standard 4 x 3 matrix layout so it can be scanned by common microcontroller units with minimal I O lines and straightforward matrix scanning code. Space efficient input: Twelve keys in a compact module provide numeric and function input without adding bulk to enclosures or panels. Durable, low profile construction: The membrane switch design reduces moving parts, enabling a slim assembly that is easy to mount and conceal in product designs. Consistent tactile response: Engineered for reliable key actuation suitable for user interfaces and repeated use in prototypes and production units. Fast implementation: As a readymade matrix keyboard module, it eliminates the need to design and lay out discrete switches, saving development time. Features and attributes Function: 12 key input arranged as a 4 x 3 matrix for scanning by microcontrollers. Compatibility: Intended for MCU based systems and any controllers that support matrix keyboard scanning. Material: Membrane switch construction for a thin, flexible keypad surface. Layout and wiring: 4 rows and 3 columns matrix organization simplifies wiring and firmware scanning. Performance: Stable electrical contact for consistent key detection and minimal debounce requirements when used with standard scanning routines. Practical applications Embedded control panels: Numeric entry and simple menu navigation for industrial controllers, laboratory instruments, and HVAC interface units. DIY electronics and prototyping: Quick addition of a numeric keypad to microcontroller projects, development boards, and learning kits. Access and transaction terminals: Input module for access control panels, small point of terminals, and vending or kiosk interfaces. Integration tips Connect the module to your MCU using the 4 row and 3 column lines and implement a standard matrix scan routine with debounce handling in firmware. Mount the membrane against a flat surface or panel cutout for a neat, low profile finish. Pair with indicator LEDs or an LCD for a complete user interface in compact enclosures. This 12 key MCU membrane switch keypad provides a simple, reliable input solution for any application requiring a compact numeric or function keypad that integrates easily with microcontroller based systems.