The TinyShield Circle Edge LED Boards allows some cool and easy LED indications using only six I/O signals. This board includes 21 LEDs are mounted around the outside of the board to form a full circle and is designed to be placed on the top of the TinyShield stackup. The LEDs are arranged using Charlieplexing, which is a technique to allow for control of multiple LEDs using fewer I/O signals. Available with Red, Green and Amber LED color options.