W5100 Ethernet Shield for Arduino with Micro SD Slot
Ethernet W5100 Shield Network Expansion Board for Arduino with Micro SD Card
The Ethernet W5100 shield adds reliable 10/100 Mbps wired networking to your Arduino projects. Based on the WIZnet W5100 chip, it handles TCP/IP, UDP, and HTTP protocols, making it ideal for IoT data loggers, home automation, and web-controlled devices. The integrated micro SD slot gives you onboard storage without extra wiring, perfect for logging sensor readings or serving web files.
Key Specifications
| Specification | Value |
|---|---|
| Chipset | WIZnet W5100 |
| Ethernet Standard | 10/100 Mbps |
| Interface | SPI (pins 10, 11, 12, 13) |
| Operating Voltage | 5V (from Arduino) |
| SD Card Support | Micro SD up to 32GB (SDHC) |
| Board Dimensions | 69mm x 53.5mm |
What You Can Build With This
- Web-connected weather station that uploads temperature and humidity data
- Standalone data logger that writes sensor readings to the micro SD card
- Home automation controller to switch lights or fans via a web interface
- Arduino-based web server hosting simple HTML pages or APIs
Compatibility
This shield stacks directly on Arduino Uno, Mega 2560, and Duemilanove boards. It uses the standard SPI pins (D10–D13), with pin 4 assigned to the SD card’s chip select. Both the W5100 and SD slot run at 5V logic, so no level shifting is needed for typical Arduino boards.
Wiring Notes
Simply align the header pins and press the shield onto your Arduino. The W5100 occupies SPI SS on pin 10, while the SD card uses pin 4. Avoid using those GPIOs in your sketch unless you reconfigure the chip select. Current draw is around 180 mA, so an external power supply is recommended if your setup includes multiple peripherals.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino Mega 2560?
Yes, the shield fits Mega boards directly and uses the same SPI pins (50–53) through the ICSP header, so libraries work without modification.
Can I use the Ethernet port and micro SD card at the same time?
Yes, both share the SPI bus but have separate chip selects (pin 10 for Ethernet, pin 4 for SD). Just initialize the Ethernet and SD libraries in sequence, and you can log data to the card while serving web pages.
Which libraries do I need?
Use the standard Arduino Ethernet library (built-in) for the W5100 and the SD library (also built-in) for the micro SD card. No third-party installs required.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items