If you have an old iPhone and want to do something other than trading it in, you can make it your dedicated white noise machine and alarm clock. Here's how.

If you want to make your own, Instructables user Paranoid Legend shows you how to build one with an Arduino. The alarm clock is made using a Arduino Mini and a TFT screen.

Here’s how to ditch that old alarm clock and use StandBy mode on iPhone and Bedtime mode on Android instead.