4x5 Matrix 20-Key Membrane Keypad for Arduino
4x5 Matrix 20-Key Membrane Keypad for Arduino
This is a 4x5 matrix membrane keypad with 20 keys, ideal for user input in Arduino and microcontroller projects. It uses a flexible membrane construction with conductive traces, providing a lightweight, water-resistant input solution. Commonly used in security panels, numeric entry, and menu navigation, it simplifies projects requiring multiple buttons without occupying many I/O pins.
Key Specifications
| Specification | Value |
|---|---|
| Key Matrix | 4 rows × 5 columns |
| Total Keys | 20 |
| Operating Voltage | 3.3V – 5.5V DC |
| Pin Count | 9-pin male header (2.54mm pitch) |
| Dimensions | 67mm × 76mm × 1mm |
| Cable Length | 80mm flexible ribbon |
What You Can Build With This
- Password-protected door lock system
- Arduino calculator with LCD display
- Menu navigation for LCD-based projects
- Security alarm keypad (arming/disarming)
Compatibility
Works with Arduino Uno, Nano, Mega, ESP32, ESP8266, and any board with 9 digital I/O pins. 3.3V logic tolerant. Commonly paired with the Arduino Keypad library and character LCD displays for interactive projects.
Wiring Notes
Connect the 9-pin header to digital I/O pins. For standard Keypad library usage, connect rows 0-3 to pins 5-2 and columns 0-4 to pins 9-5 (order flexible). Enable internal pull-ups on row pins; no external resistors needed. Avoid exceeding 5V on I/O pins.
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 Uno?
Yes, it works perfectly with Arduino Uno using the Keypad library. Connect any 9 digital pins and configure the library accordingly.
Does this keypad have tactile feedback?
No, it's a membrane keypad with a smooth, flat surface. Presses require light pressure but no click. It's quiet and durable.
How do I connect it to fewer pins?
Use a PCF8574 I2C backpack module to reduce pin count to 2 (SDA/SCL). Libraries like Keypad_I2C support this.
📦 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