![]() ![]() ![]() The functionality is the same and you can still use it with your pre-R3 Arduino but you may want to trim back or de-solder the extra headers. The only difference is the appearance of extra pins so that it's compatible with the Arduino Uno R3 shield design. Note: As of February, 2012, we are shipping the R3 version of this board. For the W5100, set digital pin 10 as a high output. To do this with the SD card, set pin 4 as an output and write a high to it. If you're not using one of the peripherals in your program, however, you'll need to explicitly deselect it. If you are using both peripherals in your program, this should be taken care of by the corresponding libraries. Note that because the W5100 and SD card share the SPI bus, only one can be active at a time. 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. These pins cannot be used for general i/o. On both boards, pin 10 is used to select the W5100 and pin 4 for the SD card. This is on digital pins 11, 12, and 13 on the Duemilanove and pins 50, 51, and 52 on the Mega. The reset button on the shield resets both the W5100 and the Arduino board.Īrduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). Previous revisions of the shield were not compatible with the Mega and need to be manually reset after power-up. The latest revision of the shield also includes a reset controller, to ensure that the W5100 Ethernet module is properly reset on power-up. You can access the on-board SD card slot using the SD library which is included in the current Arduino build. It is compatible with the Arduino Uno and Mega (using the Ethernet library). The latest revision of the shield adds a micro-SD card slot, which can be used to store files for serving over the network. The documentation says that SD Card and the Ethernet chip both share the SPI bus and that I have to set different pins on HIGH to tell the Ethernet shield to use the Ethernet OR the SD Card. Use the Ethernet library to write sketches which connect to the internet via a standard RJ45 Ethernet jack using the shield. In an answer Kevin Mark points to a solution/reason for the usage of the Ethernet shield together with the SD Card. The Arduino Ethernet Shield supports up to four simultaneous socket connections. It is based on the Wiznet W5100 ethernet chip providing a network (IP) stack capable of both TCP and UDP. The reset line from the Arduino (Mega) connects to the MR (Manual Reset) pin on that IC. That IC acts like a non-inverting buffer and a pulse extender. The Arduino Ethernet Shield allows an Arduino board to connect to the internet. The ethernet shield w5100 reset line is also 5 volts, but driven by a CAT811TTBI. ![]()
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