Credit card sized ethernet arduino controller

Posted on Feb 5, 2014

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

Credit card sized ethernet arduino controller
Click here to download the full size of the above Circuit.

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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