Credit card sized ethernet arduino controller

I love the Arduino as a simple and accessible controller platform for many varied projects. A few months ago, a purchased an Ethernet shield for my Arduino controller to work on some projects with a mate of mine it was a massive hit for the first time, I could control my projects remotely using simple software. That got me thinking The

Arduino costs about $30AUD, and the Ethernet board cost about $30AUD as well. That is a lot of money Could I make a simple, dedicated remote controller for much cheaper Why Yes I could. Could I make it the size of a credit card Why Yes I could! This project is my simple Arduino compatible controller that has embedded Ethernet, and the capacity to drive some extra I/O lines for projects, such as a Remote thermometer, a Remotely accessible Fridge controller, and a Remote Humidity sensor. I have to say from the start that I didn`t write all of the software, my mate Mikal did that but this instructable is about making your own controller board! There is also a 4 position DIP switch that can be used to allow programmed functions to be modified. A failing of the standard Arduino Ethernet library is that the IP address for the board has to be set in code. Using the DIP switch, a block of addresses can be selected from as required. You can make 16 boards, and have each board automatically select a different address based on the switch setting. This is *really* handy when you have deployed 10 sensors around the house. All you need to do is set a switch and then they are configured. I wrote detailed instructions in my Arduino Wordclock writeup that you can follow to etch your own board. Check out for details. One thing with this layout - I had to use a surface mount IC (a 74HC08) Please do not be too scared by the surface mount...

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