Charlie-plexing

[Demon]

The need to control a lot of LEDs arose in my residential alarm project, the most efficient I could google was charlie-plexing. I thought I'd share a chart showing combinations:

EDIT: MUST USE 1 RESISTOR PER PIN



Robert


Reference: http://ww1.microchip.com/downloads/e...Doc/40040b.pdf

EDIT: Even better reference courtesy of Charlie, clearly explains the technique:
http://www.instructables.com/id/Char...s--The-theory/

Skip down to working code and videos:
http://www.picbasic.co.uk/forum/show...132#post130132