A glove with all-fabric pressure sensors on each fingertip. The idea came from somebody else who wanted to use this as a piano teacher with children to visualize the difference between "p" piano (soft) and "f" forte (hard).
The pressure sensitive layers of fabric in the fingertips of these gloves are stretchy so that they can fit tightly. The sensors are made from stretch conductive fabric and piezoresistive Eeonyx fabric. The glove is connected to the Arduino via metal snaps and a fabric cable made from sewn conductive thread traces.
HOW THE SENSOR WORKS
The piezoresistive effect describes the changing electrical resistance of a material under mechanical pressure. Eeonyx coats a range of anti-static woven and non-woven fabrics in an inherently conductive polymer, giving them piezoresistive properties. By adhering two traces of stretch conductive fabric parallel to one another across the fingertip and then attaching a piece of piezoresistive stretch fabric on top of these, one is able to measure the change is resistance between the two conductive traces when pressure is applied through the piezoresistive material.
This is the first working prototype, things to be improved include:
- Integrating the sensors better around the shape of the fingertip, possibly knitting the glove and including conductive and resistive yarns to do so in a three layer knit
- Making sure the sensor reacts well not only to holding down pressure, but to the tapping of piano keys
- Making sure all this works on the scale of a child's hand
- Improve the software and visualization side
More information about the techniques, materials and tools used in this Instructable can be found in our KOBAKANT database How to get what you want >>