[sdiy] Using a plasma ball as a control surface?

[Nathan Trites]

I'm sure that sensing it the way you are thinking is possible, but no clue
how that would work. I think the most practical way is with LDRs: create a
voltage divider with the LDR, add similar scaling/offset processing as on a
joystick controller, and then mount them on the plasma ball in a way that
doesn't interfere with playability.

Then you'd get however many CV outs as LDRs you use.You could probably also
do this with LEDs as photodiodes.

I'm into the idea of optical theremin LDRs mounted all over a plasma ball.

Nathan

On Sun, Aug 26, 2018 at 5:59 PM, cheater00 cheater00 <cheater00 at gmail.com>
wrote:

> Hi, I was wondering if anyone tried using a plasma ball as a controller
> for an electronic circuit. I just think it would be pretty cool. The
> question really becomes how you could figure out where the beas hit.
>
> Could you send mechanical waves through the dome? Maybe this would
> modulate the current, then based on phase difference (=delay) you could
> triangulate the beam location on the sphere. If you put two transducers at
> the very bottom of the sphere you might even only need to diangulate.
>
> Could one build an electrostatic grid that would tell where the beams go
> through? Could this be scanned in an x-y scheme, like eg a pc keyboard?
>
> Has anyone got any ideas?
>
> Thanks
>
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