Arduino 3x4 Matrix Keypad 12 Key Membrane Keypad Module

Add Numeric Input to Your Arduino Projects

The 3×4 Matrix Membrane Keypad is a compact, 12-key input module featuring digits 0–9, * and # keys — the standard layout found on phone keypads and PIN entry systems. It uses a matrix scanning method to interface with just 7 GPIO pins, making it ideal for password locks, menu navigation, and data entry on Arduino and other MCU projects.

Key Specifications

• Layout: 3 columns × 4 rows = 12 keys (0–9, *, #)
• Interface: 7-pin connector (4 row + 3 column pins)
• Operating Voltage: 3.3V – 5V DC
• Type: Membrane keypad (flexible, thin, lightweight)
• Connector: 7-pin dupont-compatible ribbon cable
• Key travel: tactile membrane press
• Compatible with Arduino Keypad library

Common Applications

• PIN / password entry systems
• Door lock and security systems
• Menu and parameter input for LCD projects
• Calculator projects
• Access control and alarm systems

Package Includes

• 1 × 3×4 Membrane Keypad with ribbon cable

Works seamlessly with the Arduino Keypad library — define your row/column pins and start reading key presses in minutes. Compatible with Arduino Uno, Nano, Mega, ESP8266, ESP32, and STM32.