Introduction - If you have any usage issues, please Google them yourself
AN2103 based on GUTTA step by step to achieve a minimum PLC system
To achieve their own PLC is not difficult (to achieve a full-featured commercial PLC system or difficult),
As long as you understand the C language, will use a single chip, at the same time familiar with the basic I/O circuit, but also have the interest in this area
The most critical), you can do.