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LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad for Arduino ESP32 Pico | 5 soft keypads + 5 I2C adapters; 16 keys each, 2-pin (SDA/SCL) saves GPIO; 3.3V/5V; adhesive backing; storage case; Pi, STM32
LONELY BINARY

LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad for Arduino ESP32 Pico (STM32)

Bottom line: The LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad is a specs-and-price decision rather than a crowd-consensus one in the single board computers category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

Pros & Cons

Pros

  • ✓ Backed by LONELY BINARY's warranty and support channels

Cons

  • ✗ Check the listed dimensions, connectors and platform compatibility against your setup before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

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SpecPicks Verdict

SpecPicks scored LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad using a rating × review-volume × price-fit model applied to published specs and reviews across the single board computers category. LONELY BINARY's single board computers lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for single board computers of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • 【5-SET SOFT KEYPAD KIT (5 KEYPADS + 5 I2C ADAPTERS)】Includes 5 flexible soft 4x4 matrix keypads (16 keys each), 5 I2C adapters to simplify connections, and a storage container — suitable for multiple projects or backups.
  • 【SOFT MEMBRANE KEYPADS WITH EASY MOUNTING】Each keypad has a flexible design with double-sided adhesive tape on the back for attachment to project boxes, desks, or enclosures — for custom interfaces in robotics, security systems, or prototypes.
  • 【GPIO-SAVING I2C ADAPTERS】The included adapters enable I2C communication using just 2 GPIO pins (SDA and SCL) instead of the traditional 8, freeing up pins on your microcontroller. Compatible with Arduino, Raspberry Pi, ESP32, and more.
  • 【WIDE COMPATIBILITY】Keypads and adapters support 3.3V to 5V operation for a wide range of MCUs. Easy to program with libraries like Keypad_I2C for quick setup.
  • 【VERSATILE APPLICATIONS】Use these 4x4 keypads for numeric entry, menu navigation, or custom controls in IoT devices, home automation, smart locks, and educational projects. Soft, responsive keys provide tactile feedback in a compact form.

Full Specifications

BrandLONELY BINARY
Style5 Set (Keypads 4x4 16 keys +I2C Adapters)
MaterialFlexible membrane keypad
Model Name4x4 Matrix Keypad Kit
Style Name5 Set (Keypads 4x4 16 keys +I2C Adapters)
Unit Count5 Count
Model Number4x4 Matrix Keypad Kit
Power SourceWired
Built-In Media5 × 4x4 soft membrane matrix keypads, 5 × I2C adapter modules
Number of Keys80
Keyboard LayoutQWERTY
Mfr Part Number4x4 Matrix Keypad Kit
Antenna LocationDIY electronics prototyping, IoT control panels, Keypad input for microcontroller projects, access control systems, robotics interfaces
Hand OrientationAmbidextrous
Compatible DevicesArduino, Arduino UNO, ESP32, ESP32-S3, Raspberry Pi, Raspberry Pi Pico, ESP8266, STM32
Enclosure MaterialFlexible membrane keypad
Included Components5 × 4x4 soft membrane matrix keypads, 5 × I2C adapter modules
Keyboard DescriptionNumeric
Warranty Description1 YEAR
Connectivity TechnologyI2C Digital 4×4 Matrix Keypad Interface GPIO (via I2C adapter)
Full listing titleLONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad for Arduino ESP32 Pico | 5 soft keypads + 5 I2C adapters; 16 keys each, 2-pin (SDA/SCL) saves GPIO; 3.3V/5V; adhesive backing; storage case; Pi, STM32

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LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad for Arduino ESP32 Pico | 5 soft keypads + 5 I2C adapters; 16 keys each, 2-pin (SDA/SCL) saves GPIO; 3.3V/5V; adhesive backing; storage case; Pi, STM32 is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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LONELY BINARY 5-Set I2C 4x4 Matrix Membrane Keypad for Arduino ESP32 Pico | 5 soft keypads + 5 I2C adapters; 16 keys each, 2-pin (SDA/SCL) saves GPIO; 3.3V/5V; adhesive backing; storage case; Pi, STM32
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