Keypad, Flexible Membrane, 3x4 Matrix, 12 Key, Adhesive

Keypad, Flexible Membrane, 3x4 Matrix, 12 Key, Adhesive

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.
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.
Also, check out our keypad to serial converter!

Dimensions:

• 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

Example Code:

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 your Arduino as per the image below: