3×4 Matrix Membrane Keypad 12-Key Button Switch Keyboard Control Panel for Arduino DIY Projects

Description

A slim and lightweight 12-button input panel designed for Arduino, ESP32, Raspberry Pi, STM32, and other microcontroller-based projects — that is the 3×4 Matrix Membrane Keypad. It features 12 tactile membrane keys arranged in a 3-column by 4-row matrix, allowing easy numeric and function input while using only 7 microcontroller pins. The keypad uses the common 12-key layout: 1, 2, 3 4, 5, 6 7, 8, 9 *, 0, # Its flexible membrane construction makes it thin, easy to install, and ideal for embedding into custom control panels, electronic locks, alarm systems, vending machines, access control devices, calculators, and DIY electronics projects. The keypad connects through a flat 7-pin ribbon cable. Inte

Key Features

• 12-button membrane keypad arranged in 3×4 matrix
• Requires only 7 microcontroller pins
• Thin, lightweight, and flexible design
• Self-adhesive backing for easy mounting
• 7-pin ribbon cable connection
• Compatible with Arduino, ESP32, STM32, Raspberry Pi, and PLC systems
• Works with Arduino Keypad library
• Low power consumption
• Durable membrane surface resistant to dust and light moisture
• Ideal for password entry, menu systems, locks, alarms, and control panels

Specifications