Process to AutoTune PID using Arduino AutoTune PID Library

Projects General Guidance
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Hi all,
This is my first post here.

I am into Robotics (hobby) and I've my own sci-fi world. I want to learn and try everything out as much as I can.

I am currently seeking help in a so called project "Magnetic Levitation" both attractive and repulsive. I thought its Anti-Gravity. Some of my friends told me that Gravity can never repel. This line has increased my eagerness ( ? ? :stuck_out_tongue: ) to achieve something like that .

I have gone through many web-sites, blogs etc. By which I could make my own PID and could tune it for attractive arrangement. The output was good enough. I was satisfied. Then I started on repulsive one. Seemed tougher than that of the attractive one. PID and its tune gains were not working. Even after same tuning processes ( explained in wiki ) which has worked for attractive arrangement. Then I came across Arduino PIDLibrary and PID AutoTuner Library. I was jumping seeing the pages. :slight_smile: Please note that for attractive model I used one coil, one hall sensor and one PID, where as for repulsive I am trying it with four coils, four halls and four separate independent PIDs using Arduino Mega 2560 .

I tried it in several arrangement ( ways ) to auto tune the PID. I only tried an example of the auto tune Library. None worked. I tried it with the earlier attractive arrangement. There also it didn't work. I thought there is something I am missing. Which I need to ask everyone. Which is why I am writing my question explaining everything.

I tried the following arrangements for attractive model as:

  1. I tried keeping magnet far from the coil and hall sensor system.
  2. I tried keeping magnet below the system.
  3. I tried keeping magnet at the set point. Which gives very near gain values which I already have tested. But after tuning finishes that magnet was not able to levitate putting the gains in a simple Arduino PID library example. I have tried several times to tune it by this way only. But not avail.

I hope I'll get a lot of suggestions from here. Because ppl have interests in their respective works. Which drives everything.

To many everythings. :stuck_out_tongue:

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:drooling_face: :frowning: no reply !! ?

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There has been somedays when a new project with same Magnetic Levitation was done at our arduino forum (look out for it in exhibitions) the guy had a really nice working PID for magnetic levitation , IM attaching that programme.

MagneticLevitation.ino (7.38 KB)