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I'm looking for an alternative to conductive thread (since I lack some sewing skills). I have seen silver conductive pens but I'm wondering if they could be used for clothing?

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Maybe conductive glue will work on fabric. It is definitely cheaper than the CirquitWriter pen so if it doesn't work, there's not much harm :) "Wire Glue" is being sold in the US but you can also try to make your own by mixing graphite and glue. There is an instructable that explains the process.

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See http://www.plusea.at/ for all kinds of wearable electronics. Gluing strips of conductive fabric is probably better than conductive glue.

How To Get What You Want by the same people has more details:

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The Arduino Lilypad is a microcontroller board designed for wearables and e-textiles. Google this one and you will find tutorials and details. Also here is a good book about making electronics click with clothes:

Open Softwear 2nd Edition ISBN: 978-91-97-95540-9

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Xerox has just announced a silver ink for wearable and throwaway electronics. I think it's a bit early to use in your projects. The Silver Pen is an interesting idea. I don't know if it'll work!

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I'm not sure how practical this would be, but screenprinting might be an option. Using a screen with a coarse mesh you can print with silver paint. You would need to do a test to make sure the paint is conducting in the way you expect. I have some articles and notes on my blog pages that might help.

Screenprinting has the advantage that you can quickly make many prints of your circuit or make t-shirts to promote your event/exhibition/party.

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Here is a source for all sorts of conductive paints. http://www.lessemf.com/paint.html Some of them would probably work for painting directly on fabric.

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Yet another alternative to conductive thread: wire.

wire-wrap wire (30 AWG) or magnet wire is pretty lightweight and flexible, although constant flexing will eventually make it break.

stranded wire is a bit thicker and heavier, but it will survive flexing longer.

I imagine you would lay it out in a sort of zig-zag or sinewave curve, gluing the midpoints, so that there's a bit of slack between each glue spot to allow the fabric to stretch a little.

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