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We love LEDs! The blink(1) USB RGB LED is the best notification light for events in the cloud or on your computer. Also see the BlinkM Smart LEDs, easy-to-use RGB LEDs for Arduino & Raspberry Pi.
Tod E. Kurt is the creator of the blink(1) USB LED and BlinkM Smart LEDs. He has written for MAKE magazine, is the author of Hacking Roomba, and is a contributor to the Arduino community.
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