Overview
The 4×4 Membrane Keypad is a compact, flexible, and user-friendly input device that allows students and hobbyists to interact with Arduino, Raspberry Pi, ESP32, or STM32 projects. With 16 keys arranged in a 4×4 matrix, it’s ideal for password input, numeric entry, menu navigation, and custom control interfaces in hands-on STEM labs.
Key Features
Layout: 4×4 matrix (16 keys)
Flexible membrane design: Thin, lightweight, and durable
Easy to interface: Connects directly to microcontrollers via 8 digital pins
Voltage Compatibility: 3.3–5 V logic (safe for Arduino/ESP32/STM32)
Applications: Robotics, keypads for security projects, educational electronics kits, STEM experiments
Technical Specifications
| Feature | Specification |
|---|---|
| Rows | 4 |
| Columns | 4 |
| Number of Keys | 16 |
| Operating Voltage | 3.3–5 V DC |
| Logic Level | TTL compatible |
| Pin Interface | 8 pins (4 rows + 4 columns) |
| Dimensions | ~80 × 80 mm (typical) |
| Material | Flexible membrane with printed conductive traces |
| Life Cycle | >100,000 key presses |
Applications
Numeric input and password entry for Arduino projects
User interface for robotics, IoT, and home automation projects
Hands-on STEM lab exercises for digital input and matrix scanning
DIY calculators, menu navigation, and control panels
Educational kits for microcontroller input learning
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