{"title":"3x4 Phone-style Matrix Keypad","handle":"3x4-phone-style-matrix-keypad","url":"/products/3x4-phone-style-matrix-keypad","description":"This phone-style 3×4 matrix keypad features 12 buttons (0–9, *, #) with telephone-layout lettering printed on the keys. It uses a matrix scanning arrangement requiring only 7 microcontroller pins (3 columns + 4 rows) to read all 12 keys.\n\nThe keypad comes with 7 or 8 header pins pre-soldered for easy breadboard use. Starting from the left, the first three pins are columns, followed by the four row pins. If an 8th pin is present, it is unused and can be left disconnected.\n\nKey Features\n\n\nPhone-Style Layout – Letters and numbers printed on keys, just like a telephone\n\n12-Key Matrix – Standard 3×4 arrangement (0–9, *, #)\n\nPre-Soldered Headers – Ready for breadboard use out of the box\n\nSturdy Plastic Construction – Rigid body with durable plastic buttons\n\n7-Pin Interface – Matrix scanning with 3 columns + 4 rows\n\n\nPin Order\nFrom left to right: COL1, COL2, COL3, ROW1, ROW2, ROW3, ROW4. An 8th pin (if present) is unused.\n\nIdeal For\n\nTelephone and dialler projects\nSecurity keypads and access control\nMenu navigation interfaces\nArduino and microcontroller input\n\n\nPackage Contents\n\n1× 3×4 phone-style matrix keypad (with pre-soldered headers)\n\n\n\nTip: Works well with the Arduino Keypad library with minor adjustments. Also available: Membrane 3×4 Matrix Keypad (flexible version).\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":13269,"title":"Default Title","sku":"AF-1824","price":18.38,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}