LEDs - those blinky things. A must have for power indication, pin status, opto-electronic sensors, and fun blinky displays. This is a very standard LED. The lens is 3mm in diameter, and is diffused.
Adding a playback LED adds a nice visible feature for you to know when the music is playing and when it is stopped. You can use a playback LED with our JustBoom DAC Zero or Digi Zero board. View the guide on how to set this up.