4x4 Matrix Keypad for Arduino/Raspberry Pi | 16 Keys
4x4 Matrix Keypad – 16-Key Membrane Keyboard
The 4x4 matrix keypad is a 16-key input device that uses a simple 8-pin interface. It is commonly used for numeric data entry, password systems, and menu navigation in embedded projects. The membrane design offers a soft tactile feel and reliable contact over thousands of presses.
Key Specifications
| Specification | Value |
|---|---|
| Key Count | 16 (0-9, A-D, *, #) |
| Interface | 8-pin (4 rows, 4 columns) |
| Operating Voltage | 3V to 5V DC |
| Key Type | Membrane with tactile feedback |
| Active Area Dimensions | Approx 40mm x 40mm |
| Cable Length | ~85mm flexible ribbon |
What You Can Build With This
- Security keypad lock with solenoid or relay
- Arduino-based calculator with LCD display
- Menu-driven interface for sensor monitoring systems
- Music player controller with volume and track selection
Compatibility
This keypad works with any microcontroller that has at least 8 digital I/O pins, including Arduino Uno, Nano, Mega, ESP32, and Raspberry Pi. It operates at 3-5V, making it safe for both 5V and 3.3V logic. Common pairings include 16x2 LCDs for display and microcontrollers with hardware interrupt capability for efficient key scanning.
Wiring Notes
Connect the 8 pins directly to digital I/O on your board—no additional components are required. If using long wires, enable internal pull-up resistors or add external 10k pull-ups to the row pins for stable readings. Avoid connecting to analog-only pins; use standard GPIO.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, it connects directly to any Arduino digital pins. Use the Keypad library by Mark Stanley for easy integration.
Does this require soldering?
The keypad comes with a flexible ribbon cable and a separate pin header. Soldering the header to the cable is needed for breadboard use.
Can I use this with a Raspberry Pi?
Yes, the 3.3V operation is safe for Raspberry Pi GPIO. Use Python with the RPi.GPIO library to scan the matrix.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items