Bluetooth speakers and STEM toys: two items that we can almost guarantee are on every kid's holiday list this year. The BOSEbuild Speaker Cube is a DIY Bluetooth speaker for kids, because what's ...

There’s his DIY LED display controlled by an Arduino UNO. To have some text or picture for the display, he’s wired the output of a Bluetooth speaker directly to the Arduino, and sends it ...

Such products can be purchased off the shelf (usually called some variant of “electronic hearing protection”), but every hacker knows nothing beats some DIY to get exactly the features one wants.