Arduino output multiplier: What's a good way to get more pins on my Arduino?
I want more outputs for my Arduino Duemilanove. I want to run a simple 16x16 LED matrix but I'd need more pins. Most instructions I find use one of several chips such as the 7442 1 of 10 decoder IC, another option might be a couple of 4017 decade counters.
Can anybody recommend a method that is widely used and well documented?