The 4x4 Matrix Keypad Membrane is a lightweight, ultra-thin input device that provides a professional human-machine interface for any electronics project. At Electrapac, we recommend this keypad for its slim profile and easy mounting, making it perfect for security systems, data entry, and custom control panels.

Product Overview

This membrane keypad features 16 tactile buttons arranged in a 4x4 grid. It uses a multiplexed matrix design, allowing you to control 16 individual keys using only 8 microcontroller pins. Its thin, flexible construction includes a self-adhesive backing, allowing it to be stuck onto any flat surface or enclosure.

Key Features for Electrapac Customers

• Space-Saving Design: The ultra-thin membrane profile (approx. 1mm thick) ensures it doesn't add bulk to your handheld or wall-mounted devices.

• Easy Mounting: Features a peel-and-stick adhesive backing, so you can securely attach it to your project box without drilling holes or using screws.

• Multiplexed Interface: By using a matrix layout, it reduces the required I/O pins on your Arduino or Raspberry Pi from 16 down to just 8.

• Tactile Feedback: Despite its flat appearance, the keys provide a soft-touch tactile "click" sensation when pressed, ensuring the user knows the input was registered.

• Durable & Weather-Resistant: The top layer protects the internal circuitry from dust and light moisture, making it more durable than standard open-button arrays.

Pinout & Connection Guide

The keypad terminates in an 8-pin female DuPont connector (2.54mm pitch). The pins correspond to the 4 rows and 4 columns:

• Pins 1–4: Row 1, Row 2, Row 3, Row 4

• Pins 5–8: Column 1, Column 2, Column 3, Column 4

Pro-Tip for Arduino Users: Use the popular Keypad.h library for instant integration. Connect the 8 pins to any available digital I/O pins (e.g., D2 through D9) and define your keymap in the code to start reading inputs immediately.

Common Applications

• Security Systems: Creating digital code locks and password-protected entry points.

• Industrial Control: Inputting parameters or operating menus for machinery.

• Handheld Instruments: Data entry for portable testing or measuring tools.

• Home Automation: Custom smart-home control panels for lighting or climate.

Why Shop at Electrapac?

We source high-quality membrane switches with durable conductive ink to ensure long-lasting performance. Find this 4x4 Keypad and a variety of matching microcontrollers at www.electrapac.com.