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4×4 Membrane Matrix Keypad – 16 Keys for Arduino and ESP32

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4x4 Membrane Matrix Keypad - 16 Keys for Arduino and ESP32

Brand NZN Electronics CLICK IT SKU CLICK-IT-545235 Category Components

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  • Brand NZN Electronics

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Overview

A 4×4 membrane matrix keypad with 16 keys (0 to 9, A to D, * and #) for adding number entry, a PIN code or a simple menu to an Arduino, ESP32 or Raspberry Pi Pico project. It is a passive switch matrix, so it works with both 3.3V and 5V boards, plugs onto male header pins or male jumper wires through its 8-pin 2.54mm connector, and has a peel-off adhesive back for mounting on a box or panel.

Specifications

Layout4 rows x 4 columns, 16 keys
Keys0-9, A-D, * and #
Connector8-pin female header, 2.54mm pitch
PinoutPins 1-4 rows, pins 5-8 columns
Board voltage3.3V or 5V (no power pin)
Pins used8 digital pins
Panel sizeAbout 69 x 76mm
MountingSelf-adhesive back with liner
Arduino libraryKeypad (Library Manager)

Datasheets

Full technical datasheet
PDF

Quick Start guide
PDF

What’s in the box

1×
4×4 membrane keypad

With its flat tail and 8-pin connector fitted, adhesive liner on the back.

Great for

A PIN-code door lock with a servo or relay
Entering numbers into a timer or counter
Menu buttons for an LCD or OLED project
A calculator or quiz game on an Arduino

Wiring & getting started

  1. Connect the 8 pins

    With the keys facing you and the tail pointing down, pin 1 is the right-hand socket, marked 1 on the connector. Start from that socket and work leftwards: on an Uno or Nano, run keypad pins 1 to 8 to D9, D8, D7, D6, D5, D4, D3 and D2 with male-to-male jumper wires. No resistors or power wires are needed.

  2. Install the Keypad library

    In the Arduino IDE, open the Library Manager, search for Keypad and install “Keypad by Mark Stanley, Alexander Brevig”.

  3. Test it

    Copy the short test sketch from the Quick Start guide above (rowPins {9, 8, 7, 6}, colPins {5, 4, 3, 2}), choose your board and port, and upload. Open the Serial Monitor at 9600 baud: each key you press prints once.

  4. Mount it

    Peel the liner and press the keypad onto a clean, flat surface. Pass the tail through a slot instead of folding it hard at the edge.

Note: On an ESP32, avoid GPIO 34 to 39 (input only, no pull-ups) and the boot pins 0, 2, 12 and 15. Any other eight general pins work.

Specification

Specification for 4x4 Membrane Matrix Keypad - 16 Keys for Arduino and ESP32
CLICK IT SKU CLICK-IT-545235
Brand NZN Electronics

Features

A 4x4 membrane matrix keypad with 16 keys (0 to 9, A to D, * and #) for adding number entry, a PIN code or a simple menu to an Arduino, ESP32 or Raspberry Pi Pico project. It is a passive switch matrix, so it…

  • Brand NZN Electronics

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