HarrowMay 5, 2022
James Brown

A few things going on with this one that might not be obvious.
I'm controlling it with a headset that tracks my head and eye movement. It also has cameras in the eyeballs, streaming a stereo feed back to the headset. Where I look, it looks.

Another stewart platform for the mount - they're great for getting fluid and responsive motion out of cheap servos.

Apr 29, 2022 at 5:25amWeb
Show threadJames BrownApr 29, 2022

It was mostly built as a vehicle for a new eye mechanism. Traditional animatronic eyes have a pivot right in the centre of the eyeballs. I wanted to try a virtual pivot arrangement, moving all the mechanics outside of the ball.

This freed up space inside to stuff a cheap endoscope camera module.

Show threadJames BrownApr 29, 2022
I reproject the camera feeds into cubemaps, to correct the perspective and to decouple the laggy mechanical motion from my local head movement.
Show threadJames BrownApr 29, 2022
Another view, showing what's going on back there.
Show threadrtnApr 29, 2022
@ancientjames Super cool. Nice work!
Show thread🌠 holo 🌠Apr 29, 2022
@ancientjames This is SO cool.
Show threadvarx - social altMay 6, 2022
@ancientjames Oh wow, I can't remember ever seeing anything like this before! So it's basically a triangular antiprism of actuators. (It kind of tickles a memory, though, maybe of seeing some sort of stabilizing platform on a ship?)
Show threadJames BrownMay 6, 2022
@varx Once you start looking, you see it everywhere. One nice feature of a parallel manipulator like this is that the overall position error is just the average of all the servo errors (so tends to stay small). With a conventional robot arm, the error is the sum of all the individual errors (so tends to get large, without pricey high quality servos)