I am looking for the ability to control multiple BlinkM's from one serial bus (the i2c bus) on the Arduino for a project I have in mind - and a little bit of hunting around on the 'Net led me to this site :

BlinkMs are a lot of fun by themselves, but they’re also little network devices, each having its own address on an I2C network. Here’s where I think BlinkM can really shine since it makes controlling multiple RGB LEDs pretty easy. For Maker Faire, I wanted to show off this facet by having a single Arduino control a dozen or so BlinkMs on a single I2C bus. The result is shown in the little video below.

[From todbot blog » Blog Archive » Get on the BlinkM Bus with a BlinkM Cylon]

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