Compact 4x4 matrix keypad module with 16 plastic push keys for microcontroller input. Designed for simple integration with PIC, AVR, Stamp Sml and Arduino controllers, this keypad provides a reliable way to add numeric or menu entry to embedded projects. Key benefits Simple digital input for controllers: Provides 16 individually addressable keys in a single module for numeric entry, navigation, or control inputs. Efficient wiring with matrix arrangement: The 4 by 4 matrix reduces the number of microcontroller I O lines needed compared to wiring each switch separately. Easy to integrate: Works directly with common microcontroller platforms and standard scanning routines or available keypad libraries. Compact and practical: Small footprint and lightweight construction fit into tight enclosures and portable projects. Durable plastic keys: Each key is made of plastic for consistent actuation and a clean, low profile appearance. Important attributes Function: 4 by 4 matrix keyboard module providing 16 switch inputs for scanning by a microcontroller. Compatibility: Suitable for use with PIC microcontrollers, AVR chips, Stamp Sml modules and Arduinocompatible controllers. Size and form factor: Compact module designed for integration into hobby and prototype electronics where space is limited. Material: Plastic keycaps and switch assembly for everyday project use. Performance: Designed for straightforward scanning and lowlatency key detection when used with typical microcontroller code. Practical applications and scenarios DIY access panel: Use the keypad as a PIN entry interface for a door lock or access control prototype driven by a PIC or AVR microcontroller. Menu navigation on embedded displays: Pair the keypad with an Arduino controller and a small LCD to navigate menus, enter settings, or control parameters. Custom remote control or calculator: Build a handheld device that needs a compact numeric keypad for input, such as a custom remote, counter, or calculator. What you get A ready to use 4 by 4 matrix keypad module with 16 plastic keys suitable for direct connection to microcontroller projects. Integration tips Use standard matrix scanning code or readily available keypad libraries for faster setup. Mount the module in a small panel cutout or enclosure for a clean, user friendly interface. Debounce in software to ensure stable reads from mechanical switches. This keypad module offers a straightforward, space saving input solution for microcontroller projects requiring multiple key switches without excessive wiring complexity.