Embedded System Architecture with ATmega644 MCU and WIZnet Module #1438793 (License: Personal Use)

This diagram outlines a complete embedded IoT architecture where a PHP webserver sends HTTP requests via LAN/Internet to a WIZnet Ethernet module, which interfaces with an ATmega644 microcontroller over SPI. The MCU coordinates input from a keypad and magnetic stripe reader, and outputs to a 16×2 LCD display, enabling secure, networked access control or point-of-sale functionality. All components are tightly integrated for real-time bidirectional communication.

Used in technical documentation, developer tutorials, or product datasheets for embedded systems involving networked microcontrollers; targets engineers designing secure, web-integrated hardware solutions like access control terminals or payment kiosks.