5Pcs 4 x 4 Matrix Array 16 Key Membrane Switch Keypad Keyboard Description A pack of five compact membrane switch keypads, each arranged as a 4 x 4 matrix for 16 keys. These lowprofile keypads provide simple numeric and navigational input for microcontroller and single board computer projects. Key benefits Ready for prototyping and small production runs: five identical keypads let you build multiple projects or keep spares without extra sourcing. Compact, lowprofile input: 4 x 4 matrix layout supplies 16 distinct keys in a small footprint that fits panel mounts and breadboardbased prototypes. Easy integration with common platforms: designed for matrix scanning input and compatible with Arduino, AVR, Raspberry Pi, PIC and similar microcontroller systems. Simple wiring and programming: works with standard 4 x 4 keypad libraries and scanning routines, reducing setup time. Durable membrane construction: thin, flexible switch surface is suitable for repeated key presses while keeping the module low profile and unobtrusive. Features and specifications Quantity: 5 pieces Layout: 4 x 4 matrix, 16 keys per keypad Switch type: membrane switch keypad Intended use: input device for microcontrollers and single board computers such as Arduino, AVR, Raspberry Pi, PIC Typical applications: numeric entry, menu navigation, user interface for embedded systems Performance and handling Low mechanical travel for fast, repeatable keystrokes Flat surface and sealed switch assembly minimize dust accumulation compared to openswitch designs Suitable for breadboard and PCBbased prototypes when wired to a matrix input Practical use scenarios 1) Prototype keypad input for a microcontroller thermostat or timer: wire the 4 x 4 matrix to row and column inputs, use a standard keypad library to read numeric and function keys, and iterate quickly across multiple prototypes using the fivepack. 2) Control panel for a small robot or automation project: assign directional and command keys to movement, mode, and start stop functions and mount the lowprofile keypad on an operator panel. 3) Menu navigation for embedded displays: provide user entry and navigation on a compact device by mapping menu up down left right and select to keypad keys. What you get Five identical 4 x 4 matrix membrane switch keypads ready for integration into microcontroller and single board computer projects. Notes Requires wiring to digital inputs and use of a matrix scanning routine or keypad library on the host controller. Intended as a standard membrane keypad component; check physical mounting and connector requirements against your project before installation.