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Membrane 3x4 Matrix Keypad + extras - 3x4

SKU: ADA419

$6.95 AUD, inc GST
$6.32 AUD, exc GST

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

SKU: ADA419

$6.95 AUD, inc GST
$6.32 AUD, exc GST
1 reviews 0 5 5
In stock, ships today if ordered before 2PM
Delivered by Mon, 25th of Sep
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:
  • The Maker Revolution
  • The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...
  • 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...
  • 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...
  • Sound Effects Button
  • The idea for this project came when a friend of mine flew over from Western Australia to visit, and during his stopover in Adelaide, he did what any adult would do; visit the airport novelty store and buy some random stuff. It was pretty much all junk, except for this big green dome button which played a different, comic voice saying ‘YES’ every time you pressed it. Simple, but, it entertained us on the drive from Syd...

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

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