The Arduino Ethernet Shield W5100 allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip that provides a network (IP) stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library link below to write sketches which connect to the internet using the shield. Arduino uses digital pins 10, 11, 12, and 13 (SPI) to communicate with the W5100 on the ethernet shield. These pins cannot be used for general i/o. The shield provides a standard RJ45 ethernet jack.
The shield contains a number of informational LEDs:
PWR : indicates that the board and shield are powered
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 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
COLL : flashes when network collisions are detected
The jumper “INT” connects the pin of the W5100 to digital pin 2 of the Arduino.
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