4x4 Matrix Keypad

16-key keypad for passwords, menus and access-control projects.

Input ModuleRM4-RM15Beginner

Arduino ✓ESP32 ✓STM32 ✓

Use 4x4 Keypad in my FYP View related FYP titles

4x4 Matrix Keypad electronics module illustration

AI Ready Overview

Quick Summary

4x4 Keypad is a input module commonly used in FYP and embedded projects. It is best for password door lock and menu input, with wiring and testing planned around Arduino, ESP32, STM32.

Difficulty

Beginner

Time Required

1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype

Cost

RM4-RM15 module range in Malaysia; full project cost depends on scope.

Components

4x4 Keypad, Arduino, ESP32, STM32

Overview

What is 4x4 Keypad?

A 4x4 matrix keypad provides numeric and function input for access control, menus and locker systems.

Engineering Reference

Quick Specs

Operating Voltage	3.3V / 5V
Interface	GPIO matrix
Difficulty	Beginner
Typical Malaysia Price	RM4-RM15
Best For	Password door lock, Menu input

Real Usage Notes

Suitable / Not Suitable

Suitable for

✓ Password door lock
✓ Menu input
✓ Smart locker

Not suitable for

✕ Secure commercial access alone
✕ Waterproof outdoor input without enclosure

Build Planning

Difficulty

4x4 Keypad is rated Beginner. Plan around 1-3 days for basic wiring and sample code; 1 week if used inside a complete fyp prototypedepending on wiring, libraries, calibration, dashboard/app integration and testing evidence.

Build Planning

Time Required

1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype

Malaysia Price Guidance

Cost

Typical module price range: RM4-RM15. This is component guidance only; a complete FYP cost depends on controller, sensors, casing, display, app/dashboard, documentation and timeline.

Connections

Connection overview

Module revisions can use different connector names and electrical limits. Treat this as a planning overview and verify the exact board marking, manufacturer datasheet and seller documentation before wiring.

Power

Use only a supply supported by the exact board or module variant. Common listings for this part mention 3.3V or 5V.

Ground

Connect a common ground between the controller, module and any external supply.

Primary interface

Plan for GPIO matrix; confirm the exact terminal names in the manufacturer documentation.

Variant-specific connections

Connector names and optional pins can differ between breakout-board revisions.

Platform Notes

Wiring Guides

4x4 Keypad with Arduino / ESP32

This is a planning overview, not a board-specific pin map. Confirm the exact module revision, supply limits and GPIO matrix terminals in its datasheet before wiring. Use suitable level shifting when logic voltages differ.

Power	Confirm against the exact board; listed variants commonly use 3.3V / 5V
Ground	Common ground with the controller
Interface	GPIO matrix (exact pins vary by module)

Fix Common Problems