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Arduino Ethernet Shield R3

by Arduino
4.6 out of 5 stars 42 customer reviews

Available from these sellers.
  • Allows an Arduino board to connect to the internet
  • Based on the Wiznet W5100 ethernet chip
  • Supports up to four simultaneous socket connections
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Product Description

Description: 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 RJ45 Ethernet 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.


Product Information

Technical Details

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Brand Name Arduino
Item model number Rev3
Item Weight 2.1 ounces
Product Dimensions 4 x 1 x 3 inches
Item Dimensions L x W x H 4 x 1 x 3 inches

Additional Information

ASIN B006UT97FE
Customer Reviews
4.6 out of 5 stars 42 customer reviews

4.6 out of 5 stars
Best Sellers Rank #5,972 in Computers & Accessories > Computer Components
Shipping Weight 0.3 ounces
Date First Available March 29, 2009

Warranty & Support

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Customer Reviews

Top Customer Reviews

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Be advised that this particular model shield (R3) has a bug that gets in the way of uploading sketches. Remedies include either unplugging the shield from the base Arduino board before uploading, or hit the reset button immediately after the "Uploading..." message appears in the Arduino IDE.

If you plan on using the Simulink support package with this shield, the only remedy is to unplug the it from the base board (hitting reset won't do it).

Otherwise, this Ethernet shield seems to work as intended. Good luck.
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I want everything on the network (maybe not the web, but at least network accessible) and so having the arduino accessible with a network shield is amazing. There is plenty of sample code as expected with Arduino to make this shield either a webserver or a web client, and so i can get whatever data I want from my arduino to a database server or other host.

These are powerful little products. An extra thought is if more power or a more standard "computer" is necessary, consider an android based micro-computer. If less power is needed, perhaps consider a picaxe, rather than an arduino.

Either way I am impressed.
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I stacked this on my Arduino UNO, hooked it up to a Ethernet cable, downloaded a sample sketch to get the time from an internet server, and it worked immediately. What more could you ask for? It is exactly what it is supposed to be.
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Yu can't beat the quality of Arduino branded equipment like this. I have never had a failure on an Arduino product made in Italy to date and I use quite a few of them. A little more expensive but well worth it.
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I love having the ability to control my Arduino UNO R3 from any computer, tablet, or phone on the network with this. I recommend getting this for your Arduino if you want to add remote functionality to it in a place where you can run a cat 5/6 cable. After scouting Google for a bit, I was able to use some example code to power a fan from a networked computer's web browser or telent session (tel-netting to port 80). My wife was particularly fond of being able to troll me by turning my fan on and off from her laptop in the other room. The fan was hooked up to one of the four relays on the four-relay Sainsmart board for Arduino that I also purchased on Amazon (great product as well). I better not give my wife too much information about the web commands when I build a more in-depth project or she may end up hurting herself or someone else with the kind of fun she is having with this thing!
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Works excellent when paired with the Arduino. This coupled with an external WiFi adapter that simply plugs in gives your ardunio cheap and easy wireless capabilities and better range than the WiFi shields.
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I have at least a dozen Arduino's of many versions. This one is dedicated to a proto-shield to program ATtiny85 processors. It worked great right out of the box. I have another Uno dedicated to burn bootloader's in bare 328P chips for my equivalent of the Bareduino. These are great for beginners and Engineers and the open source makes it easy to cut and paste things together in very little time. Buy it.
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I honestly don't know how this could receive anything less than 5 stars unless the board simply came DOA. As you're probably aware, the ethernet shield adds internet communication capabilities to your arduino. So for example, any embedded system you create with the Arduino can be modified so that it's accessible via an internet connection. It does require use of some of the pins (digital 10-13 if I remember correctly), so it does come at a small cost to the I/O pin capabilities.

The best part is the examples library that comes with the the Arduino software already has several ethernet based projects to get you going. Within the first week of using this (actually it's been less than a week), I was able to modify the example chat server sketch to remote in and manipulate I/O pins using just a telnet client. I also tested out the example web server that reads in the 6 analog pins and displays them on a basic HTML webpage. I don't even have that good of a background in C++.

So for anyone sitting on the fence thinking you might not be able to use this, don't worry! You can easily get starter projects off the ground in a matter of days. I haven't even begun using the additional SD card slot. I'm actually not even sure what i would use it for, but I'd imagine it's primarily for storing graphics and other types of data you might use for creating more complex web pages.
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