{"product_id":"4x4-matrix-keypad-16-key-membrane-keypad-for-arduino-esp32","title":"4x4 Matrix Keypad – 16 Key Membrane Keypad for Arduino \u0026 ESP32","description":"\u003ch1\u003e4x4 Matrix Keypad – 16 Key Membrane for Arduino \u0026amp; ESP32\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis 4x4 matrix membrane keypad provides 16 tactile buttons in a compact, flexible layout ideal for numeric input, password systems, and menu navigation in Arduino, ESP32, and Raspberry Pi projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eKey Count\u003c\/th\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMatrix Layout\u003c\/th\u003e\n\u003ctd\u003e4 Rows × 4 Columns\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSwitch Type\u003c\/th\u003e\n\u003ctd\u003eMembrane (conductive rubber)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContact Rating\u003c\/th\u003e\n\u003ctd\u003e12V DC, 20mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003e8-pin 2.54mm female header\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCable Length\u003c\/th\u003e\n\u003ctd\u003e~85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e69 mm × 77 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-smart-door-lock-servo-kit-with-esp32-plus-camera\"\u003e\n\u003cstrong\u003eDigital Door Lock:\u003c\/strong\u003e Create a simple password‑protected lock using a servo motor and the Keypad library on Arduino Uno.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWi‑Fi Smart Lock:\u003c\/strong\u003e Build an IoT entry system with ESP32 that sends OTPs to a phone or logs access to the cloud.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRetro Game Console Controller:\u003c\/strong\u003e Use a Raspberry Pi to map keypad buttons as game controls for retro emulators like RetroPie.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePassword Security System:\u003c\/strong\u003e A CBSE Class 12 practical project demonstrating matrix scanning and digital I\/O with status LEDs and a buzzer.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-multi-layer-authentication-keypad-v23\"\u003e\n\u003cstrong\u003eMulti‑factor Authentication System:\u003c\/strong\u003e Combine the keypad with RFID and a database on Raspberry Pi for a college Smart India Hackathon project.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins (4 rows, 4 cols)\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eKeypad library (Arduino ESP8266)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eKeypad library (Arduino ESP32)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eMicroPython or pico‑keypad library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins (pull‑ups in software)\u003c\/td\u003e\n\u003ctd\u003eRPi.GPIO or pad4pi\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the 8‑pin female header directly to any 8 digital GPIOs on your microcontroller; the internal pull‑up resistors of the MCU are sufficient. The Keypad library for Arduino or the pad4pi module for Raspberry Pi handles matrix scanning automatically—no external components needed. Since the keypad is a passive switch matrix, voltage levels are not an issue, but ensure your GPIOs are configured as inputs with pull‑ups to avoid floating lines.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eDo I need any resistors or external pull‑ups to use this keypad?\u003c\/h3\u003e\n    \u003cp\u003eNo external resistors are required. The standard Keypad library for Arduino and similar platforms uses the microcontroller’s built‑in pull‑up resistors on the input pins, so wiring is plug‑and‑play.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan the keypad be used outdoors or in a wet environment?\u003c\/h3\u003e\n    \u003cp\u003eThe membrane surface offers some moisture resistance but is not fully waterproof. For outdoor projects, house the keypad in an appropriate enclosure to protect the connector and backside from humidity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/4x4-matrix-keypad-16-key-membrane-keypad-for-arduino-esp32#product\",\n      \"name\": \"4x4 Matrix Keypad – 16 Key Membrane for Arduino \u0026 ESP32\",\n      \"description\": \"Buy 4x4 Matrix Membrane Keypad with 16 keys online at Compoden India. Works with Arduino, ESP32, Raspberry Pi. Lowest price ₹60. 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