4x4 Matrix Keypad Module (16-Key) – Arduino, ESP32 & Raspberry Pi Compatible

4×4 Matrix Keypad Module (16-Key) – Arduino, ESP32 & Raspberry Pi Compatible

Control your projects with ease using this 4×4 Matrix Keypad Module. Featuring 16 tactile keys and simple interfacing, it’s perfect for Arduino, ESP32, and IoT applications like password systems, user input panels, and smart devices.

Description

Overview

The 4×4 Matrix Keypad Module is a compact and reliable input device designed for embedded systems and DIY electronics projects. With 16 push buttons arranged in a 4×4 grid, it allows users to input numbers, characters, and commands efficiently.

Using a matrix scanning technique, this keypad minimizes the number of GPIO pins required, making it ideal for microcontroller-based systems such as Arduino, ESP32, and Raspberry Pi.

Whether you’re building a security system, calculator, or menu-driven interface, this keypad provides a simple and effective solution.

Key Features

  • 16 Tactile Push Buttons – Responsive and durable keys
  • Matrix Configuration (4×4) – Efficient pin usage (8 pins total)
  • Compact & Lightweight Design – Easy to integrate into projects
  • Wide Compatibility – Works with Arduino, ESP32, Raspberry Pi
  • Simple Interface – Easy to program using available libraries
  • Durable Membrane/PCB Design – Long operational life
  • Plug-and-Play Friendly – Ideal for beginners and prototyping

Technical Specifications

  • Keypad Type: 4×4 Matrix (16 Keys)
  • Number of Pins: 8 (4 Rows, 4 Columns)
  • Operating Voltage: 3.3V – 5V
  • Interface: Digital (GPIO)
  • Button Type: Tactile / Membrane (variant-dependent)
  • Dimensions: Approx. 70mm x 77mm (may vary slightly)
  • Cable Type: Ribbon cable or pin header (model dependent)

Applications

  • Password-protected systems
  • Digital door locks
  • Calculator interfaces
  • Menu navigation systems
  • Smart home control panels
  • Robotics control input
  • ATM-like interfaces
  • DIY electronics and STEM kits

Why Choose This Keypad Module?

The 4×4 Matrix Keypad is a must-have input device for any electronics enthusiast or student. It offers a balance of simplicity, efficiency, and reliability, making it perfect for both learning and real-world applications.

At Alpsense, we ensure:

  • High-quality tested components
  • Compatibility with STEM learning kits
  • Beginner-friendly documentation
  • Reliable support for your projects

What’s Included

  • 1 x 4×4 Matrix Keypad Module (16 Keys)

Getting Started

This keypad can be easily interfaced with:

  • Arduino (using Keypad library)
  • ESP32 / ESP8266
  • Raspberry Pi (via GPIO scanning)

Basic Concept:
The keypad works by scanning rows and columns to detect which key is pressed—reducing wiring complexity while maintaining full functionality.

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