Our very own westfw has an instructable on this here: http://www.instructables.com/id/How-to-drive-a-lot-of-LEDs-from-a-few-microcontrol/
Our very own westfw has an instructable on this here: http://www.instructables.com/id/How-to-drive-a-lot-of-LEDs-from-a-few-microcontrol/