Stretch Sensitive Bracelet

Knit from conductive thread, resistive yarn and regular yarn. This bracelet does not light up unless you stretch it, remaining off while you wear it.

The conductive yarn used to knit the stretch sensor in this bracelet has a high resistance to it, that decreases when stretched. This means that the more the bracelet is stretched, the lower the resistance, the more voltage can flow. The more voltage that flows means the LED can light up brighter.
V = i x R

The conductive yarn is an Inox steel fiber and polyester blend made by Schoeller wool - Nm 50/2 80% Polyurethane, 20% Inox steel fibre. Unfortunately they do not manufacture this wool in small quantities but we are trying to find a supplier who is interested to purchase in bulk and then re-distribute.
More information on the bulk order can be found here:
>> http://www.kobakant.at/DIY/?p=2205

To help us get an idea of how many people are potentially interested in this kind of conductive yarn, let us know by filling out this form (no obligation to buy!):
>> http://spreadsheets.google.com/viewform?formkey=dGNIRFhSbjU0RTdoeDBacEpneHNNbFE6MA


VIDEO

Step 1 Materials and Tools

Materials
* Regular knitting yarn
* Schoeller conductive yarn - not (yet) available commercially - Nm 50/2 20% Inox steel fiber, 80% Polyester
* 117/17 2ply conductive thread
* Sewable button battery holder
* Lilypad sewable LED
* 3V button battery

Tools
* Knitting needles
* Sewing needle
* Scissors

Comments

[imakethings]

i am working on a light sensitive sweat band.hope to post an instructable soon!

[Kryptonite]

I love the concept! This could be used for so many applications, nice job!

[chloetheswot]

hi im chloe the robot im very much into all this recycling stuff id love this!!!

[golddigger1559]

 i bet it feels like steel wool but an interesting concept