DFRobot - Sealed Membrane 4×4 Matrix Keypad with Adhesive Backing

Sealed Membrane 4×4 Button Pad with Sticker is a compact human–machine input interface designed for embedded electronics, interactive control panels, and prototyping systems. This 16‑key matrix keypad provides a reliable tactile interface for entering commands, triggering functions, or navigating menus in microcontroller projects. The thin membrane structure combines flexible circuitry with a durable sealed surface, enabling dependable operation in compact enclosures or educational prototypes. Adhesive backing allows rapid installation on flat surfaces, transforming this matrix keypad module into a convenient control interface for robotics, automation systems, and microcontroller-based electronics.

Compact 16‑Key Matrix Input Design

This membrane keypad module features a classic 4×4 matrix layout delivering sixteen independent buttons through a row‑column scanning structure. Such architecture minimizes required I/O pins while enabling full numeric and functional input capability. The matrix keypad design integrates easily with microcontroller platforms including Arduino, embedded development boards, and custom electronics. For prototyping environments, the keypad provides an intuitive command interface suitable for password entry systems, device configuration panels, or menu navigation controls in embedded projects.

Thin Sealed Membrane with Adhesive Mounting

A flexible membrane construction protects the internal switch contacts from dust and mechanical wear while maintaining a lightweight and low‑profile structure. The sealed keypad surface improves durability compared with exposed mechanical buttons, making the input module suitable for portable electronics and educational kits. Integrated adhesive backing enables quick attachment to project enclosures, instrument panels, or prototyping boards without additional mounting hardware. This slim membrane keypad therefore serves as a practical user‑input solution for compact embedded systems.

Practical integration appears in embedded automation and IoT demonstrations such as the How to Make an Mail Alarm project, where keypad input works alongside motion detection and an FireBeetle ESP32 IOT Microcontroller. Combined with components including the Digital Infrared Motion Sensor For Arduino, status LEDs such as the 5mm LED Pack (50 pcs), and supporting electronics like the 220R Resistor, this numeric keypad interface enables practical control panels, security inputs, and interactive embedded systems.

• 16-button (4×4) matrix keypad layout
• Thin sealed membrane structure for durability
• Adhesive backing for easy mounting on flat surfaces
• Matrix scanning design reduces required microcontroller I/O pins
• Suitable for embedded control panels and educational electronics

• Password entry systems
• Embedded control panels
• Robotics command input
• Electronic door lock interfaces
• Interactive STEM education projects

Basic Parameters

• Keypad Type: 4×4 matrix membrane keypad
• Number of Keys: 16
• Interface: Matrix row/column connection
• Mounting Method: Adhesive backing

Physical Characteristics

• Structure: Sealed membrane switch panel
• Form Factor: Flexible flat keypad

• Sealed Membrane 4×4 Button Pad with Sticker x1