If you look in the playground:-
http://www.arduino.cc/playground/Main/InterfacingWithHardware
You will see links to this sort of project.
Basically, for just on / off use a shift register.
For fading 16 LEDs use a TLC5940 (again see playground)
If you look in the playground:-
http://www.arduino.cc/playground/Main/InterfacingWithHardware
You will see links to this sort of project.
Basically, for just on / off use a shift register.
For fading 16 LEDs use a TLC5940 (again see playground)