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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
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | ATTINY1614 |
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