Soft Circuits: LED Feelings Pizza
Electronics. Part III.
Using a new piece of thread for each LED, sew a numbered terminal (whichever ones are easiest to reach with a stitch) on the LilyTwinkle to the positive terminal on an LED, and cut and tie off the thread. Make sure the LEDs are placed on the spots you marked earlier to match up with the locations of the pepperonis.
Once all your LEDs are sewn to the LilyTwinkle board, use one long piece of conductive thread to connect the negative terminals of the LEDs to each other and then to the negative terminal on the LilyTwinkle. Tie off the thread, and cut it.