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New Keypad tutorial has been added in the tutorial section. This tutorial will give you complete information on interfacing, construction and programming. Tutorial includes C and assembly codes for AVR and 8051 microcontroller. So you must go through this tutorial. Following are the topic covered in the tutorial.

Keypad interfacing with Microcontrollers Tutorial

Introduction
Introduction to Keypad. Constructing
and scanning a matrix keypad.

Connecting a Keypad
Connection diagram of keypad with
AVR and 8051 microcontroller.

Keypad program for AVR
Programming example in both C as well as
assembly for a 4x4 matrix keypad.

Keypad program for 8051
Programming example in both C as well as
assembly for a 4x4 matrix keypad.