Difference between revisions of "How to drive many leds with a few io-pins"
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Revision as of 22:07, 12 July 2010
For any straightforward led matrix you can double the number of leds by using tri-state switching and parallel reversed leds.
The 12F509 Knight Rider uses this technique to switch 12 leds with only 5 I/O pins (the 6th pin is input only, so 5 is the max for the 12F509).