{"product_id":"4x4-matrix-keypad-for-arduinoraspberry-pi-16-keys","title":"4x4 Matrix Keypad for Arduino\/Raspberry Pi | 16 Keys","description":"\u003ch1\u003e4x4 Matrix Keypad – 16-Key Membrane Keyboard\u003c\/h1\u003e\n\n\u003cp\u003eThe 4x4 matrix keypad is a 16-key input device that uses a simple 8-pin interface. It is commonly used for numeric data entry, password systems, and menu navigation in embedded projects. The membrane design offers a soft tactile feel and reliable contact over thousands of presses.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eKey Count\u003c\/td\u003e\n\u003ctd\u003e16 (0-9, A-D, *, #)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003e8-pin (4 rows, 4 columns)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3V to 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eKey Type\u003c\/td\u003e\n\u003ctd\u003eMembrane with tactile feedback\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eActive Area Dimensions\u003c\/td\u003e\n\u003ctd\u003eApprox 40mm x 40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCable Length\u003c\/td\u003e\n\u003ctd\u003e~85mm flexible ribbon\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\u003eSecurity keypad lock with solenoid or relay\u003c\/li\u003e\n  \u003cli\u003eArduino-based calculator with LCD display\u003c\/li\u003e\n  \u003cli\u003eMenu-driven interface for sensor monitoring systems\u003c\/li\u003e\n  \u003cli\u003eMusic player controller with volume and track selection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis keypad works with any microcontroller that has at least 8 digital I\/O pins, including Arduino Uno, Nano, Mega, ESP32, and Raspberry Pi. It operates at 3-5V, making it safe for both 5V and 3.3V logic. Common pairings include 16x2 LCDs for display and microcontrollers with hardware interrupt capability for efficient key scanning.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the 8 pins directly to digital I\/O on your board—no additional components are required. If using long wires, enable internal pull-up resistors or add external 10k pull-ups to the row pins for stable readings. Avoid connecting to analog-only pins; use standard GPIO.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, it connects directly to any Arduino digital pins. Use the Keypad library by Mark Stanley for easy integration.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this require soldering?\u003c\/summary\u003e\u003cp\u003eThe keypad comes with a flexible ribbon cable and a separate pin header. Soldering the header to the cable is needed for breadboard use.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this with a Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eYes, the 3.3V operation is safe for Raspberry Pi GPIO. Use Python with the RPi.GPIO library to scan the matrix.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445078974829,"sku":"CDN-0931","price":95.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_376f18b0-c8ae-4d15-b676-3155590f140b.jpg?v=1781513178","url":"https:\/\/compoden.com\/products\/4x4-matrix-keypad-for-arduinoraspberry-pi-16-keys","provider":"Compoden","version":"1.0","type":"link"}