Arduino Ethernet Shield w5100
Arduino Ethernet Shield w5100
Arduino Ethernet Shield w5100
Arduino Ethernet Shield w5100

Arduino Ethernet Shield w5100

Arduino Shields
ARD625
Part.No: W5100
€19.90
In Stock
Immediate Dispatch
W5100 Arduino Ethernet Shield by Kuongshun — add wired internet connectivity to your Arduino board via the Wiznet W5100 chip. Supports TCP & UDP, up to 4 simultaneous socket connections, and includes a micro SD card slot. Fully compatible with Arduino UNO and MEGA.

 

The Kuongshun Arduino Ethernet Shield (MPN: W5100) is a plug-on shield that gives any Arduino board full wired internet access. Built around the industry-proven Wiznet W5100 hardwired TCP/IP controller, it offloads all network processing from the Arduino MCU, freeing your sketch to focus on application logic rather than protocol handling.

Key Features

  • Wiznet W5100 Chip: Hardwired TCP/IP stack — no software IP stack needed, reducing firmware complexity and improving reliability.
  • TCP & UDP Support: Full support for both protocols → suitable for web clients, servers, and UDP-based IoT data streaming.
  • 4 Simultaneous Socket Connections: Handle multiple network conversations at once → ideal for small web servers or multi-sensor reporting.
  • Micro SD Card Slot: Store web pages, config files, or sensor logs locally → expands project storage without extra hardware.
  • MEGA Compatible: Long wire-wrap headers pass all Arduino pins through → stack additional shields or use with Arduino MEGA.
  • On-board Reset Controller: Ensures reliable power-on initialisation of both the shield and the host board → more stable deployments.
  • Standard Arduino Ethernet Library: Works out-of-the-box with the built-in Ethernet.h library → minimal setup, extensive community examples.

Pinout & Wiring

The shield connects directly on top of an Arduino UNO or MEGA via the standard female headers — no soldering required. Key SPI signals used internally by the W5100:

Arduino PinSymbolDescription
D10SS (W5100)SPI Chip Select for Ethernet controller
D4SS (SD)SPI Chip Select for micro SD card
D11MOSISPI Master Out
D12MISOSPI Master In
D13SCKSPI Clock

Wiring note: Pins D10–D13 are reserved by the shield. When using the SD card simultaneously, pin D4 is also reserved. All remaining digital and analog pins remain accessible via the pass-through headers.

Compatibility

  • Arduino UNO (R3 & earlier): Direct pin-compatible — primary target platform.
  • Arduino MEGA 2560: Compatible via long wire-wrap headers included on the shield.
  • Arduino Ethernet Library: Use #include <Ethernet.h> — no additional drivers required for the W5100.

Typical Applications

  • Home automation web server: Host a simple HTTP page on your LAN to control relays or read sensors from any browser.
  • IoT data logging: Send temperature, humidity, or energy readings to a cloud platform (ThingSpeak, MQTT broker) over TCP.
  • Remote monitoring: Stream sensor data via UDP to a PC dashboard for real-time visualisation.
  • Network-controlled robotics: Receive commands over Ethernet for precise, low-latency robot control in maker projects.
  • SD-hosted web pages: Serve static HTML files stored on the micro SD card directly from the shield.

Technical Specifications

InterfaceSPI (pins D10–D13)
Ethernet ControllerWiznet W5100
Supported ProtocolsTCP, UDP
Simultaneous Sockets4
SD Card SlotMicro SD
Form FactorArduino Shield (pass-through headers)
MEGA CompatibleYes
On-board Reset ControllerYes
BrandKuongshun
MPNW5100

FAQ

Q: Can I use this shield with an ESP32 or Raspberry Pi?
A: The shield is designed for the 5 V Arduino header standard. ESP32 and Raspberry Pi operate at 3.3 V logic; direct stacking is not recommended without level shifting.

Q: Can I use the SD card and Ethernet at the same time?
A: Yes. Both share the SPI bus but use separate chip-select pins (D10 for W5100, D4 for SD). Use the standard SD.h and Ethernet.h libraries together and manage CS pins accordingly.

Package Contents: 1 × Kuongshun W5100 Arduino Ethernet Shield.
Note: A standard RJ45 Ethernet cable (not included) is required. Micro SD card is not included.
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