Intended for use by children and their piano teachers 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 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.
>> Instructable
>> Download glove stencil
>> Download cable and connection stencil
The sensors are made from stretch conductive fabric and Eeonyx stretchy resistive fabric, allowing for the whole glove to remain stretchy. It is connected to the Arduino via metal snaps and a fabric cable made from sewn conductive thread traces.
The shape and layering of the fabric fingertip pressure sensors in this example project are very similar to the ones described on this site:
>> http://www.interlinkelectronics.com/force_sensors/technologies/fsr.html
Sensitive Fingertips was developed in collaboration with Dr. Umida Avloni, director of the Avloni Academy of Music, Dr. Jamshid Avloni from Eeonyx. This is a first working prototype and there are many things that need to be improved.
Hello,
I came across the ‘Sensitive Finger’ project while exploring an idea I had for a specific product that operated in a similar way to this. I’m rather excited by this for many different reasons which I would like to discuss with you at your earliest convenience.
I have provided my personal email and I am always available.
Thank you for your time.
Hey Kobakants,
Hope everything’s fine at your side of the ocean(s)!
I’ trying out some glove models – measuring particular actions – looking closely at this tutorial you have made (by the way -> a truly exellent tute)
I was wondering why you are using 4,7 µF capacitors in combination with the resistors?
Is this to create a piezoresistive effect?
greetz
Wendy from brussels
Hi Wendy!
The capacitors are for low-pass filtering the input signals. i got the tip from a comment posted on my bend sensor instructable – look at the comments:
>> http://www.instructables.com/id/Fabric_bend_sensor/
there is also an instructable on the sensitive fingertips:
>> http://www.instructables.com/id/Sensitive-Fingertips/step8/Pullup-and-low-pass-filter-circuit/
and here the wikipedia info on low-pass filters:-)
>> http://en.wikipedia.org/wiki/Low-pass_filter
hope this helps!
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