4x4 Matrix Keypad Module – 16 Button Arduino Keyboard
4x4 Matrix Keypad Module – 16 Button Arduino Keyboard
4×4 Matrix Keypad Module – 16-Button Keyboard for Arduino & DIY Projects
Unlock the full potential of your microcontroller projects with this compact 4×4 Matrix Keypad Module. Featuring 16 tactile push buttons arranged in a 4-row by 4-column grid, this breadboard-compatible module connects to your Arduino, MCU, or any compatible development board via a single 8-pin interface — saving valuable GPIO pins while giving you full alphanumeric input capability.
Whether you're building a password-protected door lock, a custom calculator, a menu navigation system, or a robotics controller, this keypad module is the perfect input solution for your next DIY electronics project.
Key Features
- 16 Tactile Buttons – Arranged in a 4×4 matrix grid for efficient, multi-function input
- 8-Pin Interface – Requires only 8 digital I/O pins, ideal for Arduino Uno, Nano, Mega, and similar boards
- Breadboard Compatible – Dupont-style connector makes plug-and-play prototyping fast and easy
- Wide Operating Temperature – Reliable performance from -40°C to 80°C
- Beginner-Friendly – Perfect for starter kits, STEM education, and hobbyist electronics
- Compact & Lightweight – Easy to integrate into any enclosure or PCB layout
- Made in Mainland China
Specifications
| Layout | 4×4 Matrix (16 buttons) |
| Interface Pins | 8-pin (4 row + 4 column) |
| Connector Type | Dupont / Breadboard compatible |
| Operating Temperature | -40°C to 80°C |
| Condition | New |
| Compatibility | Arduino, ESP32, Raspberry Pi, STM32, and most MCUs |
What's in the Box?
- 1 × 4×4 Matrix 16-Button Keypad Module (8-pin)
Great For
- Arduino starter kits & DIY electronics projects
- Security & access control systems (PIN entry)
- Robotics and automation controllers
- STEM education and classroom experiments
- Custom embedded system interfaces
Looking for more tools for your workbench or DIY kit? Check out the Electromagnetic Induction Tester – Coil & Circuit Fault Detector or the Air Compressor Pressure Gauge – DIY Tool to round out your toolkit.
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Frequently Asked Questions
Q: Is this 4×4 matrix keypad module compatible with Arduino Uno and Nano?
A: Yes! This 4×4 matrix keypad module is fully compatible with Arduino Uno, Nano, Mega, and virtually any other microcontroller board that has available digital I/O pins. Simply connect the 8 pins (4 rows, 4 columns) to your board's digital pins and use the popular Keypad.h library to get started quickly.
Q: How many I/O pins does this keypad module use?
A: The module uses 8 digital I/O pins — 4 for rows and 4 for columns. This matrix scanning approach lets you read 16 individual buttons using only 8 pins, making it highly efficient for microcontroller projects where GPIO pins are limited.
Q: Can I use this keypad module for a PIN entry or password system?
A: Absolutely. This keypad is one of the most popular choices for building PIN-entry systems, combination locks, and secure access control projects with Arduino or other MCUs. The 16 buttons include numbers (0–9) and function keys, giving you everything you need for a custom input interface.