4x4 Matrix 16Key Membrane Keypad for Arduino and Microcontroller Projects A compact, lowprofile 4x4 matrix keypad that provides 16 discrete keys in a single membrane switch assembly. Designed for easy integration with Arduino and other microcontrollers, this keypad simplifies user input for prototypes, control panels, and embedded interfaces. Key benefits Simple input for prototypes and products: Provides a reliable way to enter numbers, commands, and menu selections without complex electronics. Spacesaving design: Thin membrane construction and compact layout fit tight enclosures and portable projects. Easy to integrate: Uses a standard 4 row by 4 column matrix layout so it can be read using simple scanning code or common Arduino keypad libraries. Consistent tactile response: Membrane switch keys deliver predictable actuation across all 16 keys for uniform input behavior. Costeffective and lightweight: Minimal extra hardware required, keeping project weight and component count low. Function and compatibility 4x4 matrix arrangement with 16 separate keys, arranged in 4 rows and 4 columns. Membrane switch construction for a thin, flat profile suitable for panel mounting or embedded placement. Compatible with Arduino and other microcontroller platforms that support matrix scanning. Works well with common keypad scanning libraries. Connects via row and column lines to digital input pins for straightforward wiring and software scanning. Material and performance highlights Membrane switch material provides a shallow travel profile and consistent key actuation. Durable construction appropriate for frequent use in prototyping and light industrial control panels. Compact footprint allows installation in constrained spaces without sacrificing functionality. Practical use scenarios Arduino menu entry and control: Add numeric and command input to an Arduinobased instrument, robot controller, or data logger for navigation, parameter entry, and mode selection. Access and control panels: Use as a keypad for simple access systems, equipment control, or pointof style interfaces that require multiple discrete keys. Prototyping and educational projects: Ideal for classroom projects and hobby builds where a reliable, easytowire input method is needed for user interaction. What you get A 4x4 matrix, 16key membrane keypad ready to wire into your microcontroller project. Simple interface using 4 row and 4 column connections, compatible with standard scanning methods and Arduino keypad libraries. This keypad is a practical, compact solution for adding multikey input to embedded systems, DIY electronics, and control panels where space and ease of integration matter.