4×4 Membrane Keypad – 16 Key Matrix Keypad

4×4 Membrane Keypad – 16 Key Matrix Keypad for Arduino, ESP32 & Microcontrollers

The 4×4 Membrane Keypad is a compact and convenient input device designed for microcontroller, embedded electronics, robotics, automation, and DIY projects. It features 16 soft-touch keys arranged in a 4×4 matrix, allowing users to enter numbers, characters, passwords, commands, and other control inputs.

The keypad includes numeric keys 0 to 9, function keys A, B, C, and D, along with * and # keys. This makes it suitable for applications requiring numeric entry as well as additional control functions.

Its membrane-based construction has no conventional mechanical switches, resulting in a thin, lightweight, and easy-to-mount design. The self-adhesive backing allows the keypad to be attached directly to project enclosures, control panels, instrument boxes, and other suitable flat surfaces.

The keypad uses an 8-pin matrix interface, consisting of four row connections and four column connections. With this arrangement, all 16 keys can be detected using only eight GPIO pins of a microcontroller. It can be interfaced with commonly used development platforms such as Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC, AVR, and other compatible controllers.

Features

• 4×4 matrix keypad configuration
• Total 16 input keys
• Numeric keys from 0 to 9
• A, B, C, and D function keys
• • and # additional input keys
• Soft-touch membrane keypad
• Thin, compact, and lightweight construction
• Flexible design for convenient installation
• Self-adhesive backing for easy mounting
• 8-pin row and column interface
• Requires only 8 GPIO connections
• No conventional mechanical switch mechanism
• Simple microcontroller interfacing
• Suitable for repeated user-input applications
• Ideal for embedded and electronic projects
• Cost-effective alternative to multiple individual push buttons

Key Layout

The standard 4×4 keypad arrangement is:

	Column 1	Column 2	Column 3	Column 4
Row 1	1	2	3	A
Row 2	4	5	6	B
Row 3	7	8	9	C
Row 4	*	0	#	D

Applications

The 4×4 Membrane Keypad is suitable for a wide range of electronics and embedded applications, including:

• Password-based security systems
• Digital door lock projects
• Access control systems
• PIN entry systems
• Home automation projects
• Robotics control systems
• Menu navigation interfaces
• Industrial control panels
• Electronic instruments
• Vending machine prototypes
• Attendance systems
• Arduino and ESP32 projects
• Embedded system prototypes
• DIY electronics projects

It provides a practical solution whenever multiple user-input buttons are required while keeping the interface compact and reducing the need for individual push-button switches.

Package Includes

1 × 4×4 Membrane Keypad – 16 Key Matrix

Product Disclaimer

Product images are for representation purposes only. The actual product may vary slightly in appearance, colour, dimensions, markings, connector style, or other minor details depending on the manufacturer, production batch, or availability. These variations do not necessarily affect the intended functionality of the product. Please refer to the product specifications and description before placing your order.

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