Description
The 3×4 12-Key Matrix Membrane Switch Keypad is a compact and easy-to-use input device featuring 12 buttons arranged in a 3×4 grid, similar to a traditional telephone keypad. Its thin, flexible membrane construction makes it suitable for projects where space is limited or where a flat control panel is preferred.
The keypad uses a matrix output, allowing a microcontroller to identify which button is being pressed by scanning the rows and columns. With 3 columns and 4 rows, the keypad can be scanned using 7 microcontroller pins, making it straightforward to interface with Arduino and other microcontroller boards.
An adhesive backing allows the keypad to be attached directly to a suitable surface by simply removing the protective paper. The included extra-long header strip makes it convenient to connect the keypad to a breadboard or development circuit.
It can be used for PIN/password entry, numeric controls, Arduino projects, automation systems, electronic equipment, instrument panels, and other user-interface applications.
Specifications
| Specification | Details |
|---|---|
| Product Name | Membrane Switch |
| Keypad Layout | 3 × 4 Matrix |
| Number of Keys | 12 |
| Output Type | Matrix |
| Matrix Configuration | 3 Columns × 4 Rows |
| Operating Voltage | DC 12V |
| Current | 30mA |
| Contact Resistance | ≥100 Ohm |
| Connector | 7-Pin Header |
| Connector Pitch | 2.54mm |
| Interface | Matrix |
| Material | Plastic |
| Mounting Type | Panel Mount, Front |
| Design | Ultra-thin, Flexible |
| Backing | Adhesive |
| Microcontroller Pins Required | 7 |
| Weight | 9g |
| Package Content | 1 × Membrane Switch |
Features
- 12 tactile membrane buttons in a 3×4 layout
- Matrix-style output for easy button scanning
- Requires 7 microcontroller pins
- Thin and flexible construction
- Adhesive backing for easy panel mounting
- 2.54mm-pitch connector
- Easy to interface with Arduino and other microcontrollers
- Suitable for numeric and password/PIN input
- Compact design for space-constrained projects
Applications
- Arduino and microcontroller projects
- PIN and password entry systems
- Numeric input panels
- Home automation systems
- Electronic control panels
- Industrial equipment
- Instrumentation and DIY electronics
- Access control and security projects
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