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It is very simple to install and easy to program in Arduino. I used an Arduino leonardo Eth connected to one I2C dimmer board and one 8 channel relay board and created an iPhone app to control 8 lights and 4 dimmable LED lights. It works very well. You can also create a web server on the Arduino board so that you can control the board by just using the browser.
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On the plus side the hex address of the board can be changed simply with the on-board switches giving access to eight addresses and if the two different sets of 3F and 27 are used then this goes up to 16 distinct addresses which means that up to 16 boards can be used on the bus. The pull up resistors can also be disabled very simply with the on-board switches which means that no de-soldering is required. The only minus I can give is not for the board itself but to the fact that this is only available as a four channel board so if you need less channels you will end up with unused channels.
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