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:
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!):
Step 1: Materials and Tools
* 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
* Knitting needles
* Sewing needle