3×4 Flexible Keypad
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Overview
3×4 Flexible Keypad – 12-Key Matrix Membrane Keyboard
Add a compact physical control interface to your electronics projects with the 3×4 Flexible Keypad. Featuring 12 keys arranged in a 3-row × 4-column matrix, this flexible membrane keypad is designed for numerical input, PIN entry, menu navigation, and simple device control.
Its matrix arrangement allows the 12 keys to be scanned using just 7 signal lines—three rows and four columns—helping conserve valuable GPIO pins on your microcontroller.
The flexible membrane construction provides a slim, lightweight form factor that can be easily incorporated into project enclosures, panels, and embedded systems. It works well with popular development platforms including Arduino, ESP32, Raspberry Pi, and other compatible microcontrollers.
Use it to build digital locks, password systems, calculators, access-control prototypes, automation controllers, security projects, menu interfaces, and educational electronics applications.
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Product Technical Information
Technical Details
Compact 12-Key Input
The 3×4 Flexible Keypad provides 12 individual keys arranged in a 3×4 matrix. It is an excellent choice when a project requires a simple numerical or command input interface but does not need the additional keys of a 4×4 keypad.
The flexible membrane format also makes it suitable for compact enclosures and embedded applications.
Efficient Matrix Configuration
The keypad uses a row-and-column matrix to reduce the number of connections required.
A typical 3×4 matrix uses:
- 3 row connections
- 4 column connections
- 7 total signal connections
A microcontroller scans these lines to determine which key is pressed.
Flexible Membrane Construction
The thin and flexible design makes this keypad easy to integrate into project housings and control panels. It can be particularly useful where available space is limited.
Arduino and ESP32 Compatible
The keypad can be integrated with a wide range of development platforms, including:
- Arduino Uno
- Arduino Nano
- Arduino Mega
- ESP32
- ESP8266
- Raspberry Pi
- STM32
- Other compatible microcontrollers
The keypad is a passive switch matrix, while the connected controller handles key scanning and interpretation.
Ideal for PIN and Password Entry
The 12-key arrangement is well suited to applications where numerical input is the primary requirement. It can be combined with a microcontroller and display to create a password or PIN-entry system.
Suitable Applications
The 3×4 flexible keypad can be used for:
- Digital lock prototypes
- PIN and password systems
- Access-control projects
- Calculators
- Security-system prototypes
- Menu interfaces
- Home automation
- Robotics
- Control panels
- Vending-machine prototypes
- Arduino projects
- ESP32 projects
- Raspberry Pi projects
- Educational electronics
- DIY embedded systems
Works with Displays
Combine the keypad with an LCD, OLED, TFT, or other display to create interactive interfaces. Users can enter numbers, select menu options, enter PINs, or configure parameters.
Space-Saving Input Solution
Compared with larger keypads, the 3×4 format offers a smaller footprint while still providing enough keys for many numerical-input applications.
Important: The keypad is a passive switch matrix and does not contain a controller or power-regulation circuitry. A compatible microcontroller or scanning circuit is required to interpret key presses.
Frequently Asked Questions
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