Memorial day is 05/25/2015 – Orders will ship out on May 26th. There will not be any deliveries or shipping on Monday. Any order placed after 11am ET on Friday May 22nd will not start to ship out until Tuesday May 26th.

Membrane 3x4 Matrix Keypad + extras - 3x4

PRODUCT ID: 419
$3.95
QTY DISCOUNT
1-9$3.95
10-99$3.56
100+$3.16
  • Description

    Description-

    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.

  • Technical Details

    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

    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 "Arduino.h"
    #include "Keypad.h"
    
    const byte ROWS = 4; //four rows
    const byte COLS = 3; //three columns
    char keys[ROWS][COLS] = {
      {'1','2','3'},
      {'4','5','6'},
      {'7','8','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

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    Learn+

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