{"product_id":"5-set-i2c-4x4-matrix-membrane-keypad","title":"5-Set I2C 4x4 Matrix Membrane Keypad","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-SET SOFT KEYPAD KIT (5 KEYPADS + 5 I2C ADAPTERS)\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSOFT MEMBRANE KEYPADS WITH EASY MOUNTING\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGPIO-SAVING I2C ADAPTERS\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWIDE COMPATIBILITY\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVERSATILE APPLICATIONS\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eLONELY BINARY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Devices\u003c\/th\u003e\n\u003ctd\u003eArduino, Arduino UNO, ESP32, ESP32-S3, Raspberry Pi, Raspberry Pi Pico, ESP8266, STM32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnectivity Technology\u003c\/th\u003e\n\u003ctd\u003eI2C Digital 4×4 Matrix Keypad Interface GPIO (via I2C adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyboard Description\u003c\/th\u003e\n\u003ctd\u003eNumeric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Uses For Product\u003c\/th\u003e\n\u003ctd\u003eDIY electronics prototyping, IoT control panels, Keypad input for microcontroller projects, access control systems, robotics interfaces\nDIY electronics prototyping, IoT control panels, Keypad input for microcontroller projects, access control systems, robotics interfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecial Feature\u003c\/th\u003e\n\u003ctd\u003eBuilt-in adhesive backing for easy mounting on panels and enclosures, I2C interface, GPIO-saving (2-pin), 4x4 16-key matrix, soft membrane, adhesive backing, PCF8574 adapter included, 3.3V\/5V compatible, Multiple keypads supported on a shared I2C bus using PCF8574-based adapters, Soft membrane 4×4 matrix keypad with 16 clearly labeled keys, Wide voltage support from 3.3V to 5V for broad microcontroller compatibility\nBuilt-in adhesive backing for easy mounting on panels and enclosures, I2C interface, GPIO-saving (2-pin), 4x4 16-key matrix, soft membrane, adhesive backing, PCF8574 adapter included, 3.3V\/5V compatible, Multiple keypads s… See more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStyle\u003c\/th\u003e\n\u003ctd\u003e5 Set (Keypads 4x4 16 keys +I2C Adapters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eFlexible membrane keypad\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded Components\u003c\/th\u003e\n\u003ctd\u003e5 × 4x4 soft membrane matrix keypads, 5 × I2C adapter modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModel Name\u003c\/th\u003e\n\u003ctd\u003e4x4 Matrix Keypad Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Lonely Binary","offers":[{"title":"Default Title","offer_id":48884154597533,"sku":"B0G2KZW8KX","price":36.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0331\/9994\/7908\/files\/51b0VPQEdqL.jpg?v=1788828915","url":"https:\/\/lonelybinary.com\/en-nz\/products\/5-set-i2c-4x4-matrix-membrane-keypad","provider":"Lonely Binary","version":"1.0","type":"link"}