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I would to ask some help about your project, unfortunately I am not able to active any levitation.
A couple of premise, I realized this project for educational purposes, I make it for some scout boys.
I am sure that all the hardware is OK, I think that the problem is the tuning.
At the beginning, after a few casual tests, I was almost able to get a levitation, it was not OK, I had to hold a hand under magnet, the levitation was really unstable, but it was a start point, then I touched something, I don't know what, and after, despite many other try, I could not get the same result as before.
At this point the only choice that I have is to ask to you some questions:

  • on the interface, after the startup, appear three horizontal lines, one red, one blue and one green, what they represent? Seem to me, if I have understood right, that the red line is the signal of the Hall sensor, the green one is for the coil, but for the the blue one I did not understand.
  • on the interface there are two buttons for the e2prom, which one is used for writing and which one to read?
  • is there a way to reset, totally clean the e2prom to bring all the values ​​back to default?
  • can you give me some medium values ​​for the PID part and also for the setting part?
  • can you give some precise information for the magnets? both magnet, the one what goes on top of the bolt and to one that should float.
  • I saw that the interface can save and reload a configuration file, can you share your working configuration?

could you better describe the calibration procedure? I read what you have already written but I could not understand very well the procedure.
I understand that this are too many questions and that maybe you will have little time to devote to these things and I would to apologize for bother, but I promised this project to some guys and I don't like to let them down.

Thank you