Arduino Ethernet Shield

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Arduino Ethernet Shield R3 Front


Arduino Ethernet Shield R3 Back

Arduino Ethernet Shield
简介
Arduino Ethernet扩展板可让Arduino电路板连接至互联网。此扩展板是基于Wiznet 以太网芯片W5100。Wiznet W5100 为TCP和UDP提供了一个网络IP。它支持最多四个同时的套接字连接。使用以太网库来写概要，它是使用扩展板连接到互联网。以太网扩展板通过长线转换延伸至扩展板的接头连接到Arduino 电路板。这使引脚布局保持不变，并允许另一个扩展板在顶层显示。

The most recent revision of the board exposes the 1.0 pinout on rev 3 of the Arduino UNO board.

The Ethernet Shield has a standard RJ-45 connection, with an integrated line transformer and Power over Ethernet enabled.

There is an onboard micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the Arduino Uno and Mega (using the Ethernet library). The onboard microSD card reader is accessible through the SD Library. When working with this library, SS is on Pin 4. The original revision of the shield contained a full-size SD card slot; this is not supported.

The shield also includes a reset controller, to ensure that the W5100 Ethernet module is properly reset on power-up. Previous revisions of the shield were not compatible with the Mega and need to be manually reset after power-up.

The current shield has a Power over Ethernet (PoE) module designed to extract power from a conventional twisted pair Category 5 Ethernet cable:

• IEEE802.3af compliant
• Low output ripple and noise (100mVpp)
• Input voltage range 36V to 57V
• Overload and short-circuit protection
• 9V Output
• High efficiency DC/DC converter: typ 75% @ 50% load
• 1500V isolation (input to output)
  

NB: the Power over Ethernet module is proprietary hardware not made by Arduino, it is a third party accessory. For more information, see the datasheet

The shield does not come with the PoE module built in, it is a separate component that must be added on.

Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the 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 or the SPI interface won't work.

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.

The shield provides a standard RJ45 ethernet jack.

The reset button on the shield resets both the W5100 and the Arduino board.

The shield contains a number of informational LEDs.

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