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AN3407

Using Matrix Keypad with AVR® Devices

Features

•Basic Overview and Example of Matrix Keypad Operation

•Easy Implementation to Other Applications

•Advanced Low-Power Implementation Example

–Fully interrupt driven operation

–Power-Down Sleep mode

–Well suited in battery-powered applications

•Software Button Debouncing

•Simple Passcode Check Implementation

•LED Passcode Validation Indicator

Introduction

Author: Amund Aune, Microchip Technology Inc.

This application note shows how a general keypad application can be implemented with tinyAVR

® and megaAVR®

devices. A conceptual overview of the operation of a matrix keypad and two demo applications are presented. One

demo shows a simple implementation of a keypad, while the second demo uses more advanced features to make the

application more efficient and use less power.

The examples in this application note may easily be changed to interface a smaller or larger matrix keypad, and are

easy to implement into another application. The application may be used in all implementations using a matrix

keypad, such as access control keypads, keyboards, or remote controls.

The code examples are available through Atmel START:

•Using Matrix Keypad with AVR Devices - Basic

–https://start.atmel.com/#example/Atmel%3AApplication_AVR_Examples%3A1.0.0%3A%3AApplication

%3AUsing_Matrix_Keypad_with_AVR_Devices_-_Basic%3A

•Using Matrix Keypad with AVR Devices - Advanced

–https://start.atmel.com/#example/Atmel%3AApplication_AVR_Examples%3A1.0.0%3A%3AApplication

%3AUsing_Matrix_Keypad_with_AVR_Devices_-_Advanced%3A

The code examples are also available through GitHub:

View Code Examples on GitHub

Click to browse repositories

© 2020 Microchip Technology Inc. Application NoteDS00003407A-page 1

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