therminish

[bobbletrox]

You know, speaking of proximity detectors, I think it'd be interesting to implement a piezoelectric-film pressure plate into an effect.  Instead of wagging your foot around in the air, you'd press your foot directly on the control surface.  A small circuit would allow the peizo film to drive the led in an optocoupler.

Here's some food for thought:
http://www.amp.com/products/technology/articles/interface.stm

[zachary vex]

You know, speaking of proximity detectors, I think it'd be interesting to implement a piezoelectric-film pressure plate into an effect.  Instead of wagging your foot around in the air, you'd press your foot directly on the control surface.  A small circuit would allow the peizo film to drive the led in an optocoupler.

Here's some food for thought:
http://www.amp.com/products/technology/articles/interface.stm

piezo films don't produce a continuous output voltage.  the piezo effect is a dynamic one, hence electronic lighters that use a sort of spring-loaded hammer to bang on a piezo crystal to generate a spark.

in the past, a pedal called patch of shades used some kind of pressure-sensitive pad to control a filter, and it probably used a resistive foam (carbon empregnated) that changed values when smooshed.  you can experiement with this effect using black foam.

[bobbletrox]

Thanks Zachary, you've got a point there *doh*

Resistive foam you say? *ponders*

[Paul Perry (Frostwave)]

There's a photo here of a shoe with a pressure-sensitive resistor built into the heel, PLUS a skin resistance emeasurement device! Text calls the shoe "non-obtrusive"!!!!!!!!! not on stage, that is for sure.
http://vismod.media.mit.edu/tech-reports/TR-432/node5.html

Seriously, it is possible to bodge up a pressure sensitive resistor by sandwitching the conductive foam that chips are stored in between metal plates, put some return springs in or eventually it will be flattened.

[bobbletrox]

Ahh, the old sensor in the shoe trick.

[troubledtom]

You know, speaking of proximity detectors, I think it'd be interesting to implement a piezoelectric-film pressure plate into an effect.  Instead of wagging your foot around in the air, you'd press your foot directly on the control surface.  A small circuit would allow the peizo film to drive the led in an optocoupler.

Here's some food for thought:
http://www.amp.com/products/technology/articles/interface.stm

piezo films don't produce a continuous output voltage.  the piezo effect is a dynamic one, hence electronic lighters that use a sort of spring-loaded hammer to bang on a piezo crystal to generate a spark.

in the past, a pedal called patch of shades used some kind of pressure-sensitive pad to control a filter, and it probably used a resistive foam (carbon empregnated) that changed values when smooshed.  you can experiement with this effect using black foam.

 hi Z,
    i 've talked to E.C. about marketing the device"patch of shades ". there are 2 versions. we'll see what happens.
      -tt

[John Egerton]

The qprox chip works...

I've tried it...

Idiot Wah mania!

Stay tuned.  :wink: