empowering creative people

    Sensors > Touch

    Membrane 3x4 Matrix Keypad + extras - 3x4

    SKU: ADA419

    $6.95 AUD, inc GST

    More Views

    Membrane 3x4 Matrix Keypad + extras - 3x4
    6.95 AUD

    SKU: ADA419

    $6.95 AUD, inc GST
    1 reviews 0 5 5
    Ships today (delivered by Wed, 1st of Mar)
    Shipping Offer

    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.

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

    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

    This product is listed in:

     > 
    Documentation and Resources:
    • All About Electrical Switches
    • On and Off. It’s the basis for all electronics, from the most sophisticated computer network to a simple circuit. Electronics is all about using one thing, to control another, input and output, on and off. Even the transistors inside modern com...
    • All About LEDs
    • Hello and welcome to our tutorial where we a look at all things LED. Now first of all, what is an LED? LED stands for Light Emitting Diode and is an electronic component used to convert electrical energy to light energy. This process is called electr...
    • Switches, Debouncing and the Arduino
    • When we boil it down, everyday interactions with electronics are usually limited to controlling stuff with switches. Whether it be turning on the lights, switching on your laptop or turning on the kettle, all examples of how a physical switch works...

    Product Comments


    Customer Reviews

    1. Review by Darryl verified purchaser
      Rating
      100

      On time and good value (Posted on 31/10/2016)

    We deliver Australia-wide with these options:

    • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
    • $6.95 for Standard Post (2-4 days, tracked)
    • $8.32 for Express Post (1-2 days, tracked)
    • Pickup - Free! Only available to customers who live in the Newcastle region

    If you order lots of gear, the postage amount might increment based on the weight of your order.

    Our physical address:

    Unit 18, 132 Garden Grove Parade
    Adamstown
    NSW, 2289
    Australia

    Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.