Multiplexing LEDs explained

Multiplexing and charlieplexing can be quite a confusing task, and requires the use of transistors to switch the negative channels. I made this sketch to help people understand this concept and how to address each led. Also I am using this type of setup for my new 8x8 dual color led array display :D Hoping to have that created in Fritzing soon so I can share it with everyone.

I will have the code uploaded for this project as well very soon.

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shaiss 7 months, 3 weeks ago

I believe this would be Chipiplexing, http://www.edn.com/design/power-management/4324895/-Chipiplexing-efficiently-drives-multiple-LEDs-using-few-microcontroller-ports#id2781800-39-a, not Charlieplexing which does not use NPN transistors. More info on Charlieplexing: http://www.pcbheaven.com/wikipages/Charlieplexing/