The hardware equivalent of
hello world is an LED flash, which is a great test to ensure that everything is working and that you have wired it correctly. To make it a little more interesting, I've suggested using an RGB LED (it has red, green, and blue LEDs combined into a single unit), but feel free to use separate LEDs if that is all you have available.
You will need the following equipment:
Each of the previous components should only cost a few dollars and can be reused for other projects afterwards. The breadboard ...