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The DeunDuino repository on GitHub is a project for an ESP32-based Arduino development board created by a user named deunlee. The repository contains various resources for the DeunDuino board, including examples, images, and PlatformIO configuration files.

The DeunDuino NET is a specific board within this project that incorporates the W5500 Ethernet controller. Here are the summarized details about the DeunDuino NET board:

• It uses an ESP32-S3 microcontroller (ESP32-S3-WROOM-1) combined with a W5500 Ethernet controller.
• The board features a dual-core 32-bit CPU that can run up to 240MHz and includes 512KB SRAM + 2MB PSRAM and 16MB flash memory.
• It supports Wi-Fi (2.4GHz, IEEE 802.11b/g/n), Bluetooth LE 5, and mesh networking.
• The board has two USB ports for UART (serial), OTG, and JTAG debugging.
• It includes a 100BaseTX Ethernet PHY/MAC controller that can support up to 8 sockets simultaneously.
• The board has a Type-C USB connector, which supports C-to-C cables and PD chargers.
• There is a microSD card slot that supports up to 32GB.
• The DeunDuino NET features 4 LED indicators for power, TXD, RXD, and a user-configurable RGB LED (GPIO48).
• It has an I2C pin header for an OLED display, specifically recommending a 1.30 inch, 64 x 128 display.
• The board allows for sketch uploads without the need to press the boot button.
• It is designed to be similar in size and pinout to the Arduino Uno.
• The board includes overcurrent protection for USB, reverse polarity protection for USB, and ESD protection for both USB and the SD card.
• It can accept multiple power sources at the same time, with the pin header having the highest priority.
• The board uses a high-efficiency synchronous step-down converter for power, with up to 95% efficiency.
• It has a 4-layer PCB design with inner ground planes to ensure a proper return path for all signals, and all differential pairs are length-matched.

The repository also includes example code for using the Ethernet HTTP, NeoPixel RGB LED, and OLED Display with the DeunDuino NET board.

The DeunDuino project is not currently registered on the PlatformIO, so users need to add it manually by copying the provided JSON and directory files to specific paths in their PlatformIO installation.

It's important to note that the creator has no current plans to sell the board due to certification costs but is open to sample inquiries via the email provided on the GitHub profile.