<div dir="ltr">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. <div><br></div><div>Then you'd get however many CV outs as LDRs you use.You could probably also do this with LEDs as photodiodes. </div><div><br></div><div>I'm into the idea of optical theremin LDRs mounted all over a plasma ball. <br></div><div><br></div><div>Nathan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 26, 2018 at 5:59 PM, cheater00 cheater00 <span dir="ltr"><<a href="mailto:cheater00@gmail.com" target="_blank">cheater00@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<div><br></div><div>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.</div><div><br></div><div>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?</div><div><br></div><div>Has anyone got any ideas?</div><div><br></div><div>Thanks</div>
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