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The simple project is somewhat like the "Hello world!" application for a microcontroller, about the most simple project that can be done. It is explained in good detail, to allow the reader to understand the basic concepts behind using the tools on an AVR microcontroller.
The more sophisticated demo project builds on top of that simple project, and adds some controls to it. It touches a number of avr-libc's basic concepts on its way.
A comprehensive example on using the standard IO facilities intends to explain that complex topic, using a practical microcontroller peripheral setup with one RS-232 connection, and an HD44780-compatible industry-standard LCD display.
The Example using the two-wire interface (TWI) project explains the use of the two-wire hardware interface (also known as "I2C") that is present on many AVR controllers.
Modules | |
A simple project | |
A more sophisticated project | |
Using the standard IO facilities | |
Example using the two-wire interface (TWI) |