It's all stand-alone, which is pretty kewl. Give it a connection and a few volts -- it'll happily start up and begin sensing things and controlling its lights. You can imagine keeping these in a data center, with DHCP and a dynamic DNS client. Plug it in, it reports its IP to you and awaits queries about the environment, or commands for the LEDs. (Or reads sensors and sets LEDs by its own logic, while it waits for a human.)
The whole thing -- board, power adapter, cable, sensors, lights -- is well under a hundred bucks!
Download my kludgey arduino code and my chaotic fritzing layout, if you like. (Remember, it's a weekend project -- it doesn't have to be pretty.)
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