2*4 matrix keyboard/8 keys independent key module

Description

Product Overview

The 2×4 Matrix Keyboard Module is a compact and efficient input device featuring 8 independent tactile micro-switches arranged in a 2-row by 4-column matrix configuration . This module is specifically designed as an external keyboard expansion for single-chip microcomputers, providing a convenient alternative to using eight separate tact switches .

The matrix design is key to its efficiency. By arranging the 8 keys in rows and columns, the module requires only 6 I/O pins (2 rows + 4 columns) to read all 8 buttons, rather than 8 individual pins. This matrix scanning approach significantly conserves your microcontroller’s valuable GPIO resources, making it an excellent choice for projects where I/O pins are limited .

Pre-soldered pin headers on the module allow for immediate breadboard or jumper wire connection, eliminating the need for soldering . The PCB includes four 3mm mounting holes, enabling secure attachment to enclosures, robot chassis, or prototyping platforms.

Whether you are building a custom control panel for a robot, designing a numeric keypad for a DIY calculator, creating a menu selection interface for an automation project, or teaching students the fundamentals of keyboard scanning, this 2×4 matrix keyboard module provides a simple, reliable, and space-saving solution for direct user input to your Arduino, ESP32, STM32, or other microcontroller projects.

Key Features

• 1×2 Matrix Layout: 8 individual tactile micro-switches arranged in 2 rows and 4 columns for intuitive numeric and functional input

• I/O Efficient Matrix Design: Requires only 6 GPIO pins (2 rows + 4 columns) to read 8 buttons, significantly reducing pin usage from 8 individual pins

• Tactile Micro-Switches: Quality pushbuttons provide positive tactile feedback with each press

• Pre-Soldered Male Header Pins: Ready to insert into breadboards or connect with female-to-female jumper wires – no soldering required

• Compact & Portable: Small footprint (approx. 34mm × 32mm) fits easily into tight project enclosures and is very easy to carry

• Standard 2.54mm (0.1″) Pin Spacing: Compatible with standard breadboards, perfboards, and Dupont jumper wires

• Mounting Holes: Four 3mm (M3) holes for secure attachment to cases, robot chassis, or panels

• Clear Function Markings: Silkscreen labels on the PCB indicate each key’s position and connection points, simplifying wiring

Technical Specifications