Electronic Embroidery

Step 4 Sew the positive side of the circuit

Hold the LED in place with one hand. Thread the needle with conductive thread. Bring the needle through from the back on the outside of the square coil. Bring the needle from front to back inside the square coil, stitching over the metal lead. Continue to make stitches all around the square coil. This makes a strong mechanical and electrical connection. Backstitch a line down to the positive battery connector following the pattern. Hold the battery holder in place with one hand, and sew it in place with the other. Notice we're sewing the end with the + on it (not the -). Stitch it the same way as the LED. You'll reach a point when the needle will no longer fit through the hole because it will be too ful of stitches.

Without cutting the thread, stitch a path (still in backstitch) to the other firefly, and sew the square-coiled lead the same way you did the first. Tie off the thread. Weave it back along the stitched line the same way you do with the regular floss, then cut it. The reason you weave it back is that the end tends to fray, which could cause a short circuit if it were near another conductive trace.