Arduino W5100 Ethernet Shield

  • There is on-board voltage regulation, so you can use 5-12V VCC input. The signal pins support both 3.3V and 5V levels.
Ethernet01.jpg W5100-01.jpg

Connection to Arduino

  • Pins 10,11,12 and 13 on an Arduino are used for the Ethernet Module as shown below.
PIN Function Arduino PIN Suggested Color
2 Vin 5V +5V RED
3 RESET n/c  
4 SS or NSS (Slave Select) 10 ORANGE
5 SCK or CK (SPI Interface) 13 YELLOW
6 MOSI or MO (SPI Interface) 11 GREEN
7 MISO or MI (SPI Interface) 12 BLUE
8,9,10 No Connection n/c n/c

The function of the LEDs

PWR:indicates that the module is powered
LINK:indicates the presence of a network link and flashes when the shield transmits or receives data
FDX: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