![]() Do this several more times, looping around from the back of the fabric to the front, going through the + petal each time. Now make a stitch going into the hole in the hole in the + petal on the power supply. The knot at the end of the thread will keep the thread from pulling out of the fabric. Coming from the back of the fabric to the front, poke the needle into the fabric right next to the + petal on the power supply and then, from the front of the fabric, pull it through. Do not cut the thread too close to the knot or it will quickly unravel. Tie a knot at the end of the longer length of thread. Thread your needle, pulling enough of the thread through the needle that it will not fall out easily. Cut a 3-4 foot length of conductive thread. If you are new to sewing, check out this great introduction before you start for info on how to thread a needle, tie knots and make stitches. Sew the + petal of the power supply down to your garment. definitely glue or sew something underneath the power supply. It's the heaviest electronic module, so put it somewhere where it will not distort the fabric too badly. ![]() ![]() If you are determined to forge ahead with a delicate fabric, choose the location for your power supply wisely. If you are working on a thin or stretch piece of fabric-first of all, reconsider this choice! It's much easier to work on a heavy piece of non-stretchy fabric. You may also want to glue or sew something underneath the power supply to help prevent it from pulling on the fabric and bouncing around as you move. I recommend gluing or sewing the battery down before starting on the rest of the project. Generally, you want to do everything you can to keep the power supply from moving around on the fabric. Small clippers like the ones shown in the photo work well, but you can also use scissors. First, trim the leads off of the back of the power supply Get out your LilyPad power supply piece and trim the metal parts that are sticking out the back of it. It will also keep everything in place and, as long as the tape sticks, make your sewing easier. This will give you a good sense of what your final piece will look like. Use double sided tape to temporarily attach LIlyPad pieces to your garment. If you want, use a ruler to make sure everything is straight and symmetrical. Use chalk or some other non-permanent marker to transfer your design to the garment. If all of this was confusing, don't worry! Just keep the LilyPad and power supply close to each other in your design. The resistance of the traces from + on the power supply to + on the LilyPad and - on the power supply to - on the LilyPad should be at most 10 Ohms. Once the voltage at the LilyPad drops below about 3.3 Volts, it will reset. 05 Amps.) This means that while 5 Volts is coming out of the power supply, the LilyPad will only be getting 3.6 Volts (5 Volts - 1.4 Volts). This means we can expect a drop of 1.4 Volts (28 Ohms *. (14 Ohms in the conductive thread that leads from the negative terminal of the power supply to the negative petal on the LilyPad and 14 Ohms in the conductive thread that ties the positive terminals together). For example, if your LilyPad is a foot away from the power supply, the total resistance of the conductive material that attaches your LilyPad to your power supply is about 28 ohms. Ohm's law says that the voltage drop across a conductive material-the amount of voltage that you lose as electricity moves through the material-is equal to the resistance of the conductive material times the amount of current that is flowing through it. (The 4-ply silver-coated thread from SparkFun that comes with the LilyPad starter kit has about 14 ohms/foot.) Depending on what modules you're using in your construction, your LilyPad can draw up to 50 milliamps (mA) of current, or. Why? Conductive thread has non-trivial resistance. ![]() If they are too far apart, you are likely to have problems with your LilyPad resetting or just not working at all. Important note about the power supply As you design, plan to keep your power supply and LilyPad main board close to each other. Stitching for power (+) is shown in red, ground (-) in black, LEDs in green, and switch inputs in purple. The photos below show the sketches for my jacket. Make a sketch of your design that you can refer to as you work. Decide where each component is going to go and figure out how you will sew them together with as few thread crossings as possible. Plan the aesthetic and electrical layout of your piece.
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