Linking the Arduino to another device, such as a speaker, will allow you to set up a chime that will trigger if the door is rattled. If your security system works with third-party accessories, you can ...

In an age of streaming media it’s easy to forget the audio CD, but they still remain ... It’s something [Daniel1111] has done with his Arduino CD player, which uses the little microcontroller ...

Once you have the audio it is fed into a pair of XR-2211 Tone decoders. This provides just three interface pins for the Arduino to watch. The annoying noise that grabs your attention at the ...