[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... up to the motion controller upstream. The Arduino source for this can be found on the project ...

I build robots that move, blink, and sometimes even creep you out. From animatronics to 3D printing experiments, I fuse mechanics, electronics, and creativity to bring ideas to life. Follow to see ...

As you can see in the video below (and, yes, it should have the phone rotated and it doesn’t), his Arduino uses a servo motor to dip a bubble wand into soap solution and then pulls it in front ...