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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

Table of Contents

Features......................................................................................................................................................... 1

Introduction.....................................................................................................................................................1

1. Block Diagram.........................................................................................................................................3

2. Theory of Operation................................................................................................................................ 4

3. Demo Operation......................................................................................................................................7

3.1. Hardware Prerequisites................................................................................................................7

3.2. Software Prerequisites................................................................................................................. 7

3.3. Running the Example................................................................................................................... 7

4. Source Code Overview........................................................................................................................... 8

4.1. Basic Operation............................................................................................................................8

4.2. Advanced Operation...................................................................................................................10

5. Power Consumption..............................................................................................................................16

5.1. Basic Operation..........................................................................................................................16

5.2. Advanced Operation...................................................................................................................16

5.3. Plotting Current Data..................................................................................................................17

6. Get Code Examples from Atmel START............................................................................................... 20

7. Get Code Examples from GitHub..........................................................................................................21

8. Revision History.................................................................................................................................... 22

The Microchip Website.................................................................................................................................23

Product Change Notification Service............................................................................................................23

Customer Support........................................................................................................................................ 23

Microchip Devices Code Protection Feature................................................................................................23

Legal Notice................................................................................................................................................. 23

Trademarks.................................................................................................................................................. 24

Quality Management System....................................................................................................................... 24

Worldwide Sales and Service.......................................................................................................................25

AN3407