4×4 Matrix Membrane Keypad – 16 Buttons
The 4×4 Matrix Membrane Keypad is a compact input device for electronics, embedded systems and robotics projects. It features 16 keys arranged in a 4-row × 4-column matrix, allowing users to enter numbers, passwords and commands while using only eight signal connections. Its thin, flexible design and adhesive backing make it easy to mount on robot panels, DIY enclosures and electronic control systems. Key Features 16 buttons: 0–9, A–D, * and # 4-row × 4-column matrix layout 8-pin interface Thin, lightweight and flexible construction Adhesive backing for mounting Compatible with Arduino, ESP32 and other supported microcontrollers
| Key layout | 4 × 4 matrix |
| Number of keys | 16 |
| Interface | 8-pin row/column matrix |
| Construction | Flexible membrane |
| Mounting | Adhesive backing |
| Applications | Password locks, robot control panels, calculators, menu navigation and access-control prototypes |
| Compatibility | Arduino, ESP32 and compatible microcontrollers |
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