The 2×2 Matrix 4 Push Button Keyboard Module is a compact and reliable input device designed for Arduino, microcontrollers, and DIY electronics projects. With 4 tactile push buttons arranged in a 2×2 matrix, this keypad provides a simple and effective way to send user input such as commands, data, or control signals to your project.

This keypad module is widely used in microcontroller projects, robotics, and automation systems in Bangladesh, thanks to its small size, durability, and easy integration. It is especially suitable for applications where space-saving and minimal input options are required.

Features:

• 2×2 matrix keypad with 4 push buttons

• Compact design – space-saving and easy to integrate into projects

• Works with Arduino, Raspberry Pi, PIC, AVR, ARM, and other microcontrollers

• Equipped with pre-soldered pin headers (rotated 90°) for quick installation

• Uses a simple row and column scanning method for detecting key presses

• M3 mounting holes for secure fitting on project enclosures

• Ideal for DIY electronics, robotics, and embedded systems

Specifications:

• Type: 2×2 Matrix Keypad Module

• Keys: 4 (arranged in 2 rows × 2 columns)

• Interface Pins: R1, R2 (rows) and L1, L2 (columns)

• Key Type: Microswitch push buttons

• Mounting Holes: 4 × 3mm (M3) holes

• Pin Headers: Pre-soldered, rotated 90°

• Compatibility: Arduino, STM32, Raspberry Pi, PIC, AVR, ESP32, ARM, and other MCUs

• Dimensions: Small and compact design for embedded projects

Applications:

• DIY Arduino and microcontroller projects

• Robotics control systems

• Menu navigation and data entry systems

• Home automation panels

• Mini calculators and digital input devices

• Educational electronics projects