Looks like we have few weeks on the blog with personal projects involving the use of additional hardware. Don't miss the following, especially for the detailed explanation of their goal...
Jefferson Rivera Patiño is a user who sends me a comprehensive tutorial with great detail not only about remotely controlling a led with Pi, but the whole process from what a Raspberry Pi is, to the installation of a Web server among others.
Congratulations and thanks for sharing it with us!.
Link: Pdf (Spanish)