Adafruit 419 Membrane Matrix Keypad 3×4

(1 customer review)

£3.49 inc VAT

Availability: 17 in stock (can be backordered)

Brand: Proto-PIC
Part Number: 419
Barcode: 5055421051716
SKU: PPADA419 Categories: , , Tags: ,

Adafruit 419 Membrane Matrix Keypad  3×4

Punch in your secret key into this numeric matrix keypad. 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.

We include a 7-pin extra-long header strip so you can plug this into a breadboard with ease.

We sell this handy kit to convert the signal from the keypad to a simple serial signal reducing the number of required pins to 3


  • 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:


#include  const byte ROWS = 4;
//four rows const byte COLS = 3;
//three columns char ke7′,’8ys[ROWS][COLS] = {   {‘1′,’2′,’3’},
{‘4′,’5′,’6′},   {”,’9’},
{‘*’,’0′,’#’} }; byte rowPins[ROWS] = {8, 7, 6, 5};
//connect to the row pinouts of the keypad byte colPins[COLS] = {4, 3, 2};
//connect to the column pinouts of the keypad Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); 

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

1 review for Adafruit 419 Membrane Matrix Keypad 3×4

  1. Samuel Newport

    Not many places sell keypads at this type of price and i was wary of how good it would be. But it came next day and has been working perfectly ever since

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