Arduino Ethernet Shield (China)

$76.5 $104.04
The Arduino Eth­er­net Shield allows an Arduino board to con­nect to the inter­net. It is based on the Wiz­net W5100 eth­er­net chip pro­vid­ing a net­work (IP) stack capa­ble of both TCP and UDP. The Arduino Eth­er­net Shield sup­ports up to four simul­ta­ne­ous sock­et con­nec­tions. Use the Eth­er­net library to write sketch­es which con­nect to the inter­net via a stan­dard RJ45Eth­er­net jack using the shield.The lat­est revi­sion of the shield adds a 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). You can access the on-board SD card slot using the SD library which is includ­ed in the cur­rent Arduino build.The lat­est revi­sion of 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 reset but­ton on the shield resets both the W5100 and the Arduino board.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.Doc­u­ments:Get­ting Start­edSchemat­ic (old)Ref­er­ence Design (old)Schemat­icRef­er­ence DesignW5100 DatasheetArduino Eth­er­net­Shield PageBil­dr Tuto­r­i­al (Serv­er)Bil­dr Tuto­r­i­al (Client)
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