4x3 Membrane Switch Matrix Keypad

This 4x3 membrane switch matrix keypad is a compact 12-button input module for adding numeric entry and simple user controls to Arduino, Raspberry Pi, ESP32, and other microcontroller projects. Arranged as a matrix keypad, it uses row-and-column scanning through standard GPIO pins, making it ideal for PIN pads, access control panels, menu navigation, alarm systems, calculators, robotics, and DIY home automation interfaces. The thin flexible membrane design fits easily into embedded enclosures and prototyping builds where a low-profile, reliable keypad interface is needed for custom control panels.