1 Arrange the lights. LEDs aren't all that bright. If you really want to be noticed, you're going to need a lot of them. Bliptronics.com builds three-LED modules that are 33 millimeters square ($5 each) and also provides the Arduino source code for them. The modules are individually controllable and available in prewired strings of 20. So I bought 10 strings and started sewing them into an old dress shirt and pants. Seriously, the project felt like it was 75 percent sewing. It was brutal. It required a lot of patience. I started at my right hip, because I wanted the Arduino to be in my pocket. Then I ran extension cables between each string of 20 so the lights would be on one continuous strand.
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