A basic 12 button keypad for user input. The buttons are setup in a matrix format. This allows a microcontroller to 'scan' the 7 output pins to see which of the 12 buttons is being pressed.

Check the examples below for correct pin-outs and such.

 

Documents:

• Datasheet
• PIC HEX Pad Tutorial
• Arduino Instructable
• Arduino Keypad Library
• Alarm System Project
• Bildr Example