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6276 LED Driver
The 6276 LED driver is useful for controlling multiple LEDs. It extends the output of the microprocessor.
Here are the parts you will need:
6276 LED driver (available here)
The 6276 LED driver is a shift register capable of handling the milliamps required to drive an LED. It is controlled digitally through four wires from a microcontroller.
Smething you should notice is that the output pin of the chip connects to the ground leg (Cathode) of the LED. The power leg of the LED is connected to a power source. This is called "sinking" the LED.