W5100 Network Ethernet Lan Shield Module
inc. Header extensions
This shield allows an Arduino to establish a wired Ethernet connection to a network and is compatible with Uno, Mega and boards with compatible I/O pins.
Features:
WIZnet W5100 Ethernet controller
Compatible with both Uno and Mega footprints
Standard RJ-45 CAT network connector
Auto MDI/MDIX (auto cable pin swap)
Acts as client or server
TCP/IP protocols include TCP, UDP, ICMP, IPv4 ARP, IGMP, Ethernet
10BaseT/100BaseTX Ethernet PHY embedded
Up to 4 simultaneous socket connections
MicroSD card slot
SPI Interface
5V compatible, operates at 3.3V internally
Resources:
Can select arbitrary MAC address, e.g., : byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
Tutorials - https://docs.arduino.cc/hardware/ethernet-shield-rev2#tutorials
LED Indicators
The shield provides a number of informational LEDs that can be useful for troubleshooting the network connection:
PWR = Indicates that the shield is being powered by the Uno or Mega.
LINK = Indicates the presence of a network link and flashes when the shield transmits or receives data.
FULLD = Indicates that the network connection is full duplex.
100M = Indicates the presence of a 100Mb/s network connection (as opposed to 10Mb/s)
RX = Flashes when the shield receives data
TX = Flashes when the shield sends data
COLL = Flashes when network collisions are detected
Package contents:
1x W5100 Ethernet Shield
1x Header extension pack
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