Tinycircuits small form factor tinycircuits asd2411 r la the tinycircuits tinyshield 16 edge leds allows some cool and easy led indications using only five io signals the 16 leds are mounted around the outside of the board making them easy to see even when the led board is in the middle of a tinyshield stack the leds are driven using charlieplexing which is a technique for controlling of multiple leds using fewer io signals a sample program for the tinyduino is available to download from