The 4×4 Matrix Keypad is a compact input device designed for Arduino, ESP8266, ESP32, and other microcontroller-based electronic projects. It features 16 keys arranged in four rows and four columns,...
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The 4×4 Matrix Keypad is a compact input device designed for Arduino, ESP8266, ESP32, and other microcontroller-based electronic projects. It features 16 keys arranged in four rows and four columns, allowing users to enter numbers, characters, and commands for a wide range of applications.
Using a row-and-column matrix interface, the keypad requires only 8 signal pins to detect all 16 keys, helping reduce GPIO usage. It is ideal for password entry systems, electronic locks, menu navigation, calculators, robotics, and DIY automation projects.
16 keys in a 4×4 matrix layout
Key arrangement: 0–9, A–D, * and #
8-pin row-and-column interface
Efficient microcontroller pin usage
Compatible with Arduino and other supported development boards
Suitable for digital input and command entry
Easy integration using compatible keypad libraries
Compact design for electronic prototyping
Arduino and ESP32 projects
Password-based door lock systems
Security and access control prototypes
Calculator projects
Menu navigation and data entry
Robotics and automation control panels
IoT devices and embedded systems
Educational electronics and DIY projects
