4x4 Matrix Membrane Switch Keypad – KSH 250 at HIMASTORES Mombasa – best electronics in Kenya
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4x4 Matrix Membrane Switch Keypad

SKU: HMJ063 Category: Sensors
KSH 250.00
In Stock

Product Description

4x4 Matrix Membrane Switch Keypad

16-Key Flexible Keypad Module for Microcontroller Projects

The 4x4 matrix membrane keypad is an ultrathin, lowcost input device that provides 16 programmable buttons in a compact, flexible package. It uses a matrix arrangement to interface with microcontrollers using only 8 I/O pins (4 rows and 4 columns), making it ideal for Arduino, ESP32, and Raspberry Pi projects [citation:2][citation:9].

16 Keys with Minimal Pin Usage - 4 rows and 4 columns for only 8 I/O pins [citation:2]
UltraThin with Adhesive Backing Easy mounting on any flat surface [citation:5]
Operating voltage: 12V DC, max current 100mA [citation:9]
Use standard Keypad library for Arduino to simplify scanning
Keys are arranged in matrix; scanning logic needed to detect presses

Technical Specifications

ParameterValue
Key Arrangement4x4 Matrix (16 keys)
Keys0-9, A, B, C, D
Rated Voltage35V DC (max)
Rated Current100mA
Contact Resistance10Ω to 500Ω
Insulation Resistance100MΩ at 100V
Life Expectancy1,000,000 cycles (tactile type)
Operating Temperature-40°C to +80°C

= Pin Configuration =

Pin NumberFunction
R1-R4Row connections (scanning output)
C1-C4Column connections (reading input)

The keypad uses an 8-pin interface (4 rows + 4 columns). The connector has standard 2.54mm pitch for breadboard compatibility [citation:5][citation:9].

Key Features

Easy Interface - Only 8 GPIO pins needed for 16 buttons [citation:2]

Flexible Design - Thin membrane material with adhesive backing [citation:2]

High Durability - Over 1,000,000 keypress life [citation:1]

Standard Layout 09, A, B, C, D keys for versatile use [citation:1]

Connector Included - 2.54mm pitch connector for breadboard

= Applications =

  1. Security and access control systems [citation:5]
  2. Menu navigation and data entry for embedded systems [citation:5]
  3. Calculator and counter projects
  4. Industrial equipment control panels
  5. Educational microcontroller projects
CostEffective Input Budget-friendly user interface solution
Simple Integration - Works with Arduino, Raspberry Pi, STM32

√ Compatible with standard keypad libraries

√ Includes adhesive backing for easy installation

√ Suitable for DIY and commercial projects

Connection Guide

Matrix scanning logic:

  1. Set one row LOW at a time
  2. Read all column pins
  3. Check for LOW signal to detect pressed key
  4. Repeat for all 4 rows
Use Arduino Keypad library for quick setup and easy scanning
Connect rows to digital outputs, columns to digital inputs with pull-ups
Pin mapping depends on specific keypad model; refer to the module or datasheet
Contact bounce may require debouncing in software

Troubleshooting

No key detected:

  • Verify wiring and pin mapping [citation:4]
  • Check connector orientation and pitch
  • Avoid using pins 0 and 1 for UART conflicts

Wrong key reads:

  • Verify row/column mapping in library setup
  • Check for damaged keypad traces