Product Description The Arduino Ethernet Shield W5100 R3 lets your Arduino board connect to a wired network using Ethernet. It is based on the Wiznet W5100 chip, offering a built-in TCP/IP stack with support for TCP and UDP protocols. With an onboard micro-SD card slot and RJ45 jack, it allows data logging, web-serving, file sharing, and many Internet of Things applications. Designed for Arduino Uno, Mega, or any compatible board with standard headers. At PowerMark Solution, we provide original W5100 R3 shields so you can expand your Arduino’s ability to connect, log, serve and network reliably in projects. Features Wiznet W5100 Ethernet controller chip with built-in TCP/IP stack. Supports up to four simultaneous socket connections (TCP/UDP). RJ45 Ethernet jack with transformer and LED indicators. Onboard micro-SD / SD card slot for data storage or serving files. Full compatibility with Arduino Ethernet library. Standard shield form factor so it stacks directly on Arduino boards. Use of SPI bus pins (digital pins 10, 11, 12, 13) for communication with the W5100; includes proper reset hardware. LEDs: power, link, 100M / 10M activity, TX/RX for network diagnostics. Uses 5V logic from Arduino; the shield draws power from the base Arduino board. Shield is revision R3, meaning updated pinouts compatible with UNO R3 and other boards with matching revision header layout. Applications Hosting simple web server on Arduino to display sensor data. Network-logging of data to SD card via shield Arduino. Remote control of devices over Ethernet (switches, relays etc.). Creating IoT devices that require stable wired connection. Serving web pages from Arduino (static content) through Ethernet. Network-based communication between multiple Arduino units. Embedded projects with local dashboard or control panel. Education / lab experiments to learn network protocols and web server basics. Technical Specifications Specification Details Ethernet Controller Chip Wiznet W5100 Network Protocols TCP, UDP Maximum Simultaneous Sockets 4 Interface SPI (via Arduino digital pins) Power Supply 5V from Arduino Logic Voltage 5V logic SD Card Slot Onboard micro-SD / SD card slot LED Indicators Power, Link, Activity, 100 Mbps indicator etc. Compatible Boards Arduino Uno, Mega, Leonardo (with standard shield pins) Form Factor Standard Arduino shield footprint Package Includes 1 × Arduino Ethernet Shield W5100 R3 Documentation Pin-out diagram showing SPI pins, SD card pins, RJ45 connections. Guide for setting up with Arduino IDE using Ethernet library. Example sketches: server, client, SD logging. FAQs Q1: Which pins on Arduino are used by this shield?A: It uses the SPI pins (digital pins 10, 11, 12, 13) for communication; pin 10 is used to select the W5100. Q2: Can I use the SD card and Ethernet simultaneously?A: Yes, but since both use the SPI bus, only one device should take control of the respective chip select at a time. Q3: What board types are compatible?A: Supports Arduino Uno, Mega, and other standard boards with matching shield headers (including R3). Q4: What power is needed?A: The shield draws power from the Arduino board’s 5V supply. Q5: How many network connections can it handle simultaneously?A: Up to four TCP/UDP socket connections. Q6: Can I serve files from SD card?A: Yes — using the SD card slot you can store and serve static files (HTML, CSS, images etc.) via Ethernet. Q7: Does it support PoE (Power over Ethernet)?A: The R3 version does not include PoE by default; PoE is typically an additional accessory. Q8: Is the shield backwards compatible with older or newer Arduino boards?A: It is designed with R3 revision headers to ensure compatibility with newer boards; older boards may require header alignment.
