Membrane 3×4 Matrix Keypad



Product ID: 2580 SKU: ELEC-2580 Categories: , Tag:

This keypad has 12 buttons, arranged in a telephone-line 3×4 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.


  • 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

There is a very nice Matrix Keypad Arduino library that works great with this item. The only thing we suggest is to change the initialization code in the examples to this:

This will swap the * and # keys and also let you connect to the Arduino to match this image


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