4×3 Matrix Keyboard 12 Key Membrane

This 4×3 Matrix Membrane Keypad features 12 tactile keys in a grid layout for precise digital input. Durable, lightweight, and easy to interface with microcontrollers like Raspberry Pi, ESP32, or STM32.

Specs:

12 keys (0–9, *, #)
Flexible membrane with adhesive back
7-pin interface for simplified I/O
Ideal for embedded systems, password input, or access control

4×3 Matrix Membrane Keypad

The 4×3 Matrix Membrane Keypad is a compact, flat-panel input device featuring 12 clearly labeled keys arranged in a 4-row by 3-column matrix. It is widely used in electronics, embedded systems, and automation projects that require numeric and symbolic user input.

Thanks to its thin profile, flexible ribbon cable, and adhesive backing, this keypad is incredibly easy to install on a variety of surfaces—from control panels to project enclosures. Its low power consumption and compatibility with popular microcontroller platforms like Raspberry Pi, STM32, and ESP8266 make it an essential component for countless interactive projects.

Additionally, the keypad’s simple 7-pin interface allows for seamless integration with digital I/O pins using basic matrix scanning code. It’s an ideal entry-level tool for engineers, hobbyists, and students.

🧪 Technical Details

Specification	Details
Keypad Type	Membrane Matrix Keypad
Matrix Layout	4 Rows × 3 Columns
Number of Keys	12 (0–9, *, #)
Switching Type	Momentary Contact
Interface Pins	7-Pin Flat Flexible Cable
Operating Voltage	3.3V – 5V (compatible with logic levels)
Contact Material	Carbon (for long life & low resistance)
Mounting Style	Adhesive Backing
Key Lifespan	> 1 Million Presses
Cable Length	~85 mm
Keypad Dimensions	70mm x 77mm
Weight	~8g
Operating Temperature	-20°C to +60°C
Response Time	< 50 ms

💡 Use Cases & Applications

This 4×3 matrix keypad is highly versatile and suitable for a wide range of practical applications:

🔐 Access Control Panels: Integrate into smart gate unlockers or DIY keypad-controlled entry systems using relay modules and microcontrollers.
📊 Menu Navigation Systems: Enable user interaction on LCD or OLED displays, allowing for option selection, numerical input, or password entry.
🧪 Industrial or Lab Equipment: Add basic operator input functionality to devices requiring calibration or configuration input.
🕹 Game Interfaces: Use for custom arcade-style games or keypad-based gaming inputs in DIY entertainment setups.
🎓 STEM Education Projects: Teach students about matrix scanning, digital input, and debounce techniques using platforms like NodeMCU or Raspberry Pi.

🛠️ Pair With

For a fully functional embedded input system, consider pairing with:

🔌 Power Supplies for stable operation
🧠 IoT Modules like ESP32 for WiFi-enabled keypads
🧩 Electronic Components such as resistors, diodes, or signal conditioners for input filtering

📺 YouTube Tutorial

🎥 Learn how to use this keypad with Arduino:
4×3 Keypad Arduino Integration Tutorial

⚠️ Precautions & Integration Tips

Debounce Logic: Add software debouncing or capacitor-based filtering for accurate keystroke detection.
Pull-Up Resistors: Ensure rows/columns are properly pulled high/low to prevent floating signals.
Avoid Sharp Bends: The flat cable should be handled carefully to avoid tearing.
Protect From Moisture: Being a membrane device, exposure to water can degrade contact materials.

🏁 Summary & CTA

The 4×3 Matrix Membrane Keypad is an affordable, durable, and space-saving solution for numeric and symbolic input across various embedded and IoT systems. Whether you’re prototyping a password door lock or designing a digital menu system, this keypad offers simple implementation and reliable results.

👉 Get yours today from Electroway and unlock limitless possibilities in your interactive electronics projects!