W5100 Ethernet Shield V1.1

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IM151104001 (5).jpg

W5100 Ethernet shield V1.1 is a WIZnet W5100 breakout board with POE and Micro-SD designed for Arduino platform. 5V/3.3V compatible operation voltage level makes it compatible with Arduino boards, leafmaple, and other Arduino compatible boards except Mega boards.

Note: the POE of W5100 shield V1.1 is dummy POE. Because in the 100M ethernet wire, 7/8 pins are not used. It will be connected to VIN pin of arduino board directly.

Go shopping W5100 Ethernet Shield V1.1 (SKU:IM151104001)


  • With Micro SD interface
  • 5V/3.3V double operational voltage level
  • 10Mb/100Mb Ethernet socket with POE
  • All electronic brick interface are broken out


PCB size 68.6mm X 55.9mm X 1.6mm
Power supply 5V
Communication Protocol SPI

Electrical Characteristics

Specification Min. Typ. Max Unit
Power voltage 3 - 5.5 VDC
Input Voltage VH: 3 - 5.5 V
Input Voltage VL: -0.3 - 0.5 V
Current Consumption - - 100 mA


IM151104001 - W5100 Ethernet Shield V1.1 - view.png

Arduino PIN Description
D9 W5100_RST
D10 W5100_CS
  • Note: D9 is the software reset pin for W5100. Active High. Send a high voltage pulse on D9 will reset W5100.


When install W5100 Ethernet shield V1.1 to Iteaduino, please check the operation voltage level of development board. If the voltage is 3.3V (IFLAT32,Leafmaple), set the Operation Level Setting switch to 3.3V. If the voltage is 5V(Arduino), set the Operation Level Setting switch to 5V.

Iteaduino communicates with both the W5100 and SD card using the SPI bus. This is on digital pins 11, 12, and 13 on the UNO/Duemilanove and pins 50, 51, and 52 on the Mega. On both boards, pin 10 is used to select the W5100 and pin 4 for the SD card. These pins cannot be used for general I/O. On the Mega, the hardware SS pin, 53, is not used to select either the W5100 or the SD card, but it must be kept as an output.

Note that because the W5100 and SD card share the SPI bus, only one can be active at a time. If you are using both peripherals in your program, this should be taken care of by the corresponding libraries. If you're not using one of the peripherals in your program, however, you'll need to explicitly deselect it. To do this with the SD card, set pin 4 as an output and write a high to it. For the W5100, set digital pin 10 as a high output.

Indicator LED

The shield contains a number of informational LEDs:

  • LNK: indicates the presence of a network link and flashes when the shield transmits or receives data
  • FEX: indicates that the network connection is full duplex
  • SPD: indicates the presence of a 100 Mb/s network connection (as opposed to 10 Mb/s)
  • RX: flashes when the shield receives data
  • TX: flashes when the shield sends data
  • COL: flashes when network collisions are detected


Datasheet of W5100 Ethernet Shield V1.1

Schematic of W5100 Ethernet Shield V1.1

Useful Links

【From Phillip Stevens】

Prepared an integrated W5500 / W5200 / W5100 code here.

  • One socket.h/.c interface.
  • Based on freeRTOS for AVR (Arduino).
  • freeRTOS/lib_iinchip
  • freeRTOS/lib_inet