As a beginner to the Arduino I had spent a fair amount of time researching them and how they work prior to investment, I had already learnt a little about www.processing.org so I was familiar with the programming environment.
This project takes very little skill to make, and I think it is ideal as a 'first' project (it gives a 'real world' application to the traditional 'LED Blink' tutorial.
This instructable aims to give beginner Arduino users a project to do, rather than teach them about electronics, so I have left out things such as the polarity of LEDs, because information like this can be found in a myriad of locations. Because of this I have made the presumption that you own (or are getting) an Arduino, can connect it to your computer, know how to strip wires and the such.
"Hear me ye foreigners, there be Angles on this here site!" - The code and hardware is designed for the English lighting system, feel free to adapt it to your preferred pattern/colours etc.
Step 1: Bits and bobs.
1 x Arduino (Duemilanove 328)
1x Breadboard, fairly large one (I don't know the size)
3 x LEDs (Red, amber and green)
USB cable for programming
Computer / laptop preferably with a desk
1 x paper clip
The paper clips shown in the picture have already been shaped. (sorry)
Step 2: Mount the Arduino
The close-up photo was taken using a home made macro lense - search instructables to find out how! :-D