I am in the process of buying a Arduino microcontroller kit - and while looking around for projects to get me started I came across this wonderful page with easy starter projects:

We'll start our tutorial with three simple light circuits. In the first one, the LED is permanently on. In the second, the LED only lights up when a button is pressed and a circuit is completed. In the third example, we'll replace the manual switch with an Arduino pin (set to output mode), so we can control the LED from our program. Here are three simple circuits to build on your breadboard:

[From protolab wiki / TutorialButtonsAndLeds]

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