A problem that I have with hobby servos is that they typically don’t have 360 degree rotation and positional feedback. That was until the Parallax Feedback 360 was released. In the adafruit product video (3:41) they actually crack the little guy open so you can see its guts. Basically it’s a normal continuous servo that uses a AS5600 contactless hall effect sensor that gives positional feedback as a pulse train.
Note – This project is a living one, and as such I’m going to update it as I work on it. The views I express are those of someone currently working on a project, and I may do dumb things as I work on it and figure out what works and what doesn’t. Anyway, fun side project. Volunteer tries to make a safe cracker for cheap (sub $40)