+Paul Huber You could use a shift register and this tutorial http://arduino.cc/en/Tutorial/ShiftOut to get it working with a few less pins. There's only 8 outputs on that so you'd still have to drive one of the digits directly from the Arduino. You could also use that chip to control the segments. Keep in mind that the chip in that tutorial can only make 1 output high at a time so you'll need something more specialized for driving all the segments of the LEDs at the same time, and for grounding the cathode of the digit you want displayed. There are ICs made specifically for driving common cathode displays but I think they would only work for one digit so you may need some multiplexing. Hopefully this helps more than it confuses you :)