The 4×4 Matrix Keypad is an input device featuring 16 push buttons arranged in a 4×4 matrix, commonly used for password systems, calculators, door locks, and Arduino projects.
The 4×4 Matrix Keypad consists of 16 tactile keys arranged in four rows and four columns. It uses a matrix configuration that allows all keys to be read using only 8 microcontroller pins.
The keypad includes numeric keys (0–9), function keys (A–D), and special characters (* and #), making it suitable for security systems, menu navigation, and user input applications.
Its thin membrane design makes it lightweight, durable, and easy to mount on project enclosures.
Key Features
16 keys (4×4 matrix layout)
Numeric and function keys
Simple row-column scanning interface
Thin membrane construction
Self-adhesive backing
Compatible with Arduino, ESP8266, ESP32, and STM32
Technical Specifications
Parameter
Value
Number of Keys
16
Layout
4×4 Matrix
Operating Voltage
3.3V / 5V Logic
Interface
8-Pin Row/Column Matrix
Type
Membrane Keypad
Pin Configuration
Pin
Function
1
Row 1
2
Row 2
3
Row 3
4
Row 4
5
Column 1
6
Column 2
7
Column 3
8
Column 4
What’s in the Box
1 × 4×4 Matrix Keypad
Ideal For
Password-protected systems
Electronic door locks
Calculator projects
Menu navigation systems
Arduino and IoT projects ⌨️
Weight
0.012 kg
Dimensions
7.7 × 7.0 × 0.1 cm
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