Microchip ATTINY1616 Handleiding

Microchip Niet gecategoriseerd ATTINY1616

Bekijk gratis de handleiding van Microchip ATTINY1616 (25 pagina’s), behorend tot de categorie Niet gecategoriseerd. Deze gids werd als nuttig beoordeeld door 12 mensen en kreeg gemiddeld 4.9 sterren uit 6.5 reviews. Heb je een vraag over Microchip ATTINY1616 of wil je andere gebruikers van dit product iets vragen? Stel een vraag

Download PDF

Pagina 1/25

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