[Cyborg] Sound-responsive dress

Eric Boyd mrericboyd at yahoo.com
Mon Oct 25 11:56:16 PDT 2010

I followed that like and it leads to another interesting project:

Heartbeat Straight Jacket (with EL wire, Stethoscope)

He uses a stethoscope and microphone to pick up a persons heart beat! 
This is something that I've always wanted to try, to see if the audio 
approach could work.  He says at the bottom:

In practice, the microphone input is barely able to pickup the audible 
sound of a heartbeat. It works, but it's not clean.  When it did work, I 
find the effect really astounding! However in public, most people found 
a blinking straight jacket far more intriguing than the stethoscope 

Which isn't that encouraging, seeing as he was already amplifying the 
audio signal TWICE (once with the stethoscope and once with the 
microphone board).

Still, nice job!  Also, interesting observations:

I learned that this project was more of a sociological experiment! A lot 
of people are rather timid about putting a stethoscope against their 
bare skin (no, they don't work through clothing). Maybe it's the fear of 
sterile, cold metal against their skin - the doctor's office coming back 
to haunt them. Maybe they're afraid of contracting a deadly viral skin 
chewing horse disease (silly). I'm not sure. The other funny thing I 
learned was that people can rarely find their own heart (oh no! I'm dead!).


On 10/25/10 12:38 PM, Sean Cusack wrote:
> Having a sound responsive EL wire outfit myself, I can say that the
> sensitivity thing isn't too hard to auto-determine. Analog sound
> response just uses a microphone in the middle of the circuit with a
> potentiometer (that's the slider) for sensitivity. It would be pretty
> easy to use a lilypad plus Skory's recommendation of doing some
> averaging and whatnot and putting out an appropriate PWM wave instead of
> using the potentiometer.
> Also, since you are using EL-wire, sparkfun has a couple EL-wire shields
> that might make life even easier. Here is a link to the cheaper one:
> http://www.sparkfun.com/commerce/product_info.php?products_id=9259
> Sean

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