I recently wrote some code to drive a 4 digit seven segment display using the arduino and 74HC595 shift register chip. The display is a seven segment common anode display with decimal dots. The pin configuration can be found here. I have connected a DS18S20 temparature sensor to read the temparature and display the reading on the seven segment display.

Here is how it looks:

Here is the arduino sketch:

Download the sketch from the link below: 

SevenSegmentTest.pde (2.27 kb)

If you have any questions, please feel free to ask me via the contact link.