Build up a tiny board that fits into ping-pong to glow in rainbow colors using RGB LED driven by attiny13 microcontroller. Device is powered from CR2032 battery and uses software switch with auto power-off. Every electronics hobbyist can replicate this DIY device visiting project homepage offering more videos, pictures, design downloadable files etc. at http://amichalec.net/2012/04/rainbow-ping-pong
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