Getting stuck into my LED matrix project, I soon ran into memory problems on the Arduino.

It turns out you can stick constant data into program memory using the PROGMEM directive, with macros provided to get it back out without having to have everything residing in RAM simultaneously.

There is a good tutorial on how to use it on the AVRFreaks forums.

I came across this site with a bunch of pre-canned recipes for bit manipulation: http://graphics.stanford.edu/~seander/bithacks.html

Love the Arduino but hate the minimal IDE it provides?

http://www.arduino.cc/playground/Code/Eclipse shows you how to develop for the Arduino in Eclipse.

I completed this project a while ago, but I thought I'd better write it up anyway.

A few years ago, I bought a CD duplicator cheaply at an auction, with the intent of upgrading it to a DVD drive. Since then, it had been collecting dust, until I got motivated enough to do something about it.

I decided to convert it into an autoloading DVD burner, using an Arduino. Read on at my blog for information on how I did it: http://alastair.d-silva.org/orbit-cd-duplicator-rebuild .