Lonely Binary I2C Heavy Duty 4x4 Matrix Keypad Kit (2-Pack) Enhance your microcontroller projects with the Lonely Binary I2C Heavy Duty Matrix Keypad Kit, featuring two robust 4x4 matrix keypads paired with dedicated I2C adapters for effortless integration. Unlike traditional matrix keypads that demand 8 GPIO pins, this innovative setup connects directly to your I2C bus using just two pins (SDA and SCL), freeing up valuable GPIO resources for additional sensors, displays, or peripherals on the same bus.
Built for durability, each keypad boasts a sturdy membrane design with 16 tactile buttons arranged in a familiar telephone-style grid, including numbers (0-9), letters (A-D), and symbols (*, #). With a compact form factor and low contact resistance, it's ideal for reliable input in demanding applications like home security door locks, custom control panels, or interactive IoT devices.
The I2C adapter simplifies setup, making it compatible with popular platforms such as Arduino, ESP32-S3, Raspberry Pi, and more—simply plug in, install a library, and start coding.
Whether you're a hobbyist prototyping a smart keypad system or an engineer building secure entry solutions, this kit offers convenience, expandability, and ease of use. No more complex wiring; enjoy seamless I2C chaining for multi-device projects without sacrificing performance.
Dual I2C-Enabled Keypads for Versatile Projects: Includes 2x heavy-duty 4x4 matrix keypads with I2C adapters, converting standard 8-pin matrix to I2C bus for use with just SDA and SCL pins—perfect for Arduino, ESP32-S3, or Raspberry Pi setups.
GPIO-Efficient Design: Saves 6 GPIO pins compared to traditional matrix keypads, allowing easy connection of other I2C devices like sensors or OLED displays on the same bus without conflicts.
Durable and Tactile Construction: Sturdy membrane keypad with 16 buttons (numbers 0-9, A-D, *, #), low contact resistance (
Compact and User-Friendly: Measures 69mm x 65.5mm x 9.7mm and weighs only 21g per unit; includes breadboard-compatible headers for quick soldering or wiring—ideal for home door locks, control panels, or interactive gadgets.
Plug-and-Play Convenience: Simple I2C integration with available libraries and example code; great for beginners and pros alike in IoT, automation, or security projects.
Package Includes:
2x Lonely Binary Heavy Duty 4x4 Matrix Keypad
2x Lonely Binary I2C Adapters