Want to sound a buzzer every time someone walks in a room? Snap a power module to a motion trigger module, snap the motion trigger to the buzzer module, and you’re done. Want to light an LED ...

You'll need an Arduino along with a bunch of various sensors to get the project rolling, and once it's all set up you'll have a simple, but cheap system to monitor your home.

Watch this video on YouTube. Full instructions on how to create your very own Arduino music player and alarm clock have been kindly published by Dejan Nedelkovski with all the code you require.