Smart desk - height adjust desk
There are many projects and tutorials related to recycle old CD/DVD players into a mini CNC Plotter based on Arduino.
This is a very lovely study clap lamp that you can build as a beginner or just for fun or as a gift.
Since it's quite simple, I won't go much into details to spare you the boring stuffs.
The code you need, the STL 3D print files will all be attached for you to get straight to work and build this beauty.
Clap light arduino | Turn on/off light with clapping