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How to drive many leds with a few io-pins

From Just in Time

Revision as of 22:45, 30 August 2006 by Veecee42 (talk | contribs)
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For any straightforward led matrix you can double the number of leds by using tri-state switching and parallel reversed leds. This means i.e. that with only 5 I/O pins you can switch 12 leds.