Description: 4x3 Keypad Keyboard 3x4 Membrane Switch Matrix Keypad 12 Key Thin & Flexible With Cable Connector & Adhesive Back Easy Surface Attachment For Arduino

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.

The 4x3 16 Key Membrane Switch Keypad is a low cost and lightweight keypad. It can be used as a human interface component for your projects. The convenient adhesive back provides a simple way to mount the keypad to any dry surface. The keypad features a total of 12 keys.

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
• Multiplexed matrix keypad wherein keys are connected in a matrix (row or column), thus only needs 7 microcontroller pins (3-columns, 4-rows).
• The presence of adhesive backing allows it to be attached

There is a very niceMatrix Keypad Arduino librarythat works great with this item. The only thing we suggest is to change the initialization code in the examples to this:

Package Include:

• 1 x 4x3 Keypad Keyboard 3x4 Membrane Switch Matrix Keypad 12 Key Thin & Flexible With Cable Connector & Adhesive Back For Easy Surface Attachment For Arduino

• 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
• Multiplexed matrix keypad wherein keys are connected in a matrix (row or column), thus only needs 7 microcontroller pins (3-columns, 4-rows).
• The presence of adhesive backing allows it to be attached