Punch in your secret key into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad. Check the tutorials tab for links to an Arduino library and example code. We include a 7-pin extra-long header strip so you can plug this into a breadboard with ease.Check out our detailed guide with wiring diagrams, libraries and example sketches for all sorts of matrix keypads.Technical Details * Weight: 7.5 grams * Keypad dimensions: 70mm x 77mm x 1mm (2.75" x 3" x 0.035") * Length of cable + connector: 85mm * 7-pin 0.1" pitch connector Check out our detailed guide with wiring diagrams, libraries and example sketches for all sorts of matrix keypads. https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2023-03-06 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2023-12-27 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2024-09-19 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2024-11-29 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2024-11-30 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2025-04-09 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2025-11-28 https://elecena.pl/product/22713256/membrane-3x4-matrix-keypad-extras-3x4 2025-11-29